Nikon N6006

aka Nikon F-601

35mm AF film SLR camera


Production details:
System: Nikon F (1959)
Maximum format:35mm full frame
Film type:135 cartridge-loaded film
Mount and Flange focal distance:Nikon F [46.5mm]
Model:Electronically controlled
Speeds:30 - 1/2000 + B
Exposure metering:Through-the-lens (TTL), open-aperture
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Physical characteristics:

Manufacturer description #1

When you're ready to start making the world's greatest pictures, the N6006 is ready for you. With built-in wide-angle flash, motor drive, three light meters, autofocus and an array of other features, the N6006 dares anyone to try new and exciting photographic techniques.


The best light meter for action photography, the N6006 uses 5-segment matrix-metering for reliable exposures even in difficult or rapidly changing light conditions. The matrix meter breaks the scene down into 5 segments, evaluates each for brightness and contrast, and provides the correct exposure of the main subject in virtually any lighting situation. In situations where you might be wondering what to do, your N6006 already knows.


For more controllable situations, or where you want to put more emphasis on a centrally located subject, center-weighted metering concentrates 75% of the exposure on the center of the viewfinder. To concentrate the exposure even further, switch to spot-metering. Now the exposure is based on a 3.5mm-diameter circle in the center of the viewfinder. The spot meter is effective when precise measurement of the subject is required.


This flash works beautifully with your N6006 light metering systems. Touch the buttons and it pops up, ready for use. This flash offers the widest coverage of any built-in speedlight (covers Nikon lenses down to 28mm). The N6006 flash also packs a wallop, offering a guide number of 43 (with ISO 100 film/feet).


Using matrix-metering, the N6006 computer evaluates the scene's available light brightness and contrast and calculates the exposure. It then fires the flash, controlling output for a balanced fIll-flash picture. You'll use this flash for everything from still-life to action photographs, since automatic flash sync speeds range from 1/125 all the way down to 30 full seconds.


Your N6006 will make superb matrix-balanced fill-flash photographs, right out of the box. But if you want to modify the power of the flash, to create brighter or more subtle tones, the N6006 offers flash compensation. Simply dial in your change to the flash power, from +1 to -3 EV.


When flash pictures are taken at high shutter speeds in dim light, the background may come out dark. For sunsets or night scenes, etc., a better background exposure may be achieved with Programmed or Aperture-Priority auto exposure mode, using slow sync. With slow sync, the flash fires at the beginning of the exposure and shutter speed is controlled between 1/125 sec. and 30 sec: the slowest shutter speed available in normal sync is 1/60 sec.


Using either the built-in speedlight or an accessory Nikon Speedlight, you can also make unusual rear-curtain sync photographs. With this technique, the flash fires at the end of the exposure, rather than at the beginning. Using slow shutter speeds, a stream of motion will appear behind the moving subject.


The N6006's autofocus system will operate in light as dim as that of one candle (EV-1). Choose Single Autofocus, where focus remains locked until you again press the shutter release, or Continuous Autofocus, where the system focuses and refocuses automatically, as long as the shutter release is slightly depressed. In either mode, if the subject is moving, Focus Tracking takes over and makes any necessary adjustments. Focus Manually using the electronic rangefinder, if you like, or press the Focus Lock Button to create off-center compositions.


Using the Program Mode (P), your N6006 will automatically set the appropriate aperture and shutter speed for you. By switching to the Auto Multi-Program mode (Pm), you automatically switch the camera to higher shutter speeds, ideal for use with telephoto lenses. Or, choose Shutter Priority (S) to freeze or blur the action. Choose Aperture Priority (A) to create a greater or shallower depth of field. Or, operate the camera on Manual (M), where you choose the aperture and shutter speeds that meet your needs. Use the Auto-Exposure Lock Button to set the exposure on the subject - then recompose any way you like. Flexible Program allows you to modify aperture and shutter speed combinations when using Program Modes.


By simply setting Auto Exposure Bracketing, the N6006 will bracket either 3 or 5 exposures for you automatically. You choose the amount of compensation between each frame in 0.3, 0.7 or 1 EV increments. Produce a range of exposures of the same subject, quickly and easily.


The N6006's self-timer lets you choose a delay of from 2 to 30 seconds. Also take two self-timer shots in a row, automatically.

Manufacturer description #2

With the Nikon N6000 you focus manually and add your own Nikon Speedlight separately. Other features are virtually identical to the N6006 - matrix-metering and center-weighted metering (no spot-meter with N6000), auto-exposure, auto-bracketing, motorized film advance, slow-sync flash, rear-curtain flash, flash compensation, 1/2000 sec. shutter speed, variable self-timer, etc.

Manufacturer description #3

TYPE OF CAMERA: Integral-motor 35mm single-lens reflex

PICTURE FORMAT: 24mm x 36mm (standard 35mm film format)

LENS MOUNT: Nikon F mount

LENS: Nikkor lenses having CPU contacts, AI-S-type Nikkor lenses*, AI-Nikkor lenses* and AI-modified Nikkor lenses* (With limitation)

FOCUS MODES: Autofocus, and manual focus with electronic rangefinder

AUTOFOCUS MODE: Focus-Priority Single autofocus and Focus-Priority Continuous autofocus

AUTOFOCUS DETECTION SYSTEM: TTL phase detection system using Nikon advanced AM200 autofocus module

AUTOFOCUS DETECTION RANGE: Approx. EV minus 1 to EV 19 (at ISO 100)

AUTOFOCUS LOCK: Possible once a stationary subject is in focus in Focus-Priority Single autofocus; Focus-Priority Continuous autofocus, focus can be locked by using AE-L/AF-L lever when AF-L function is set

ELECTRONIC RANGEFINDER: Available in manual focus mode with AF Nikkor and other AI-type Nikkor lenses with a maximum aperture of f/5.6 or faster

EXPOSURE METERING: Three types of exposure metering systems - Matrix metering, Center-Weighted metering and Spot metering

METERING RANGE: EV 0 to EV 19 (at ISO 100 with f/1.4 lens) for Matrix and Center-Weighted metering; EV 4 to EV 19 (at ISO 100) for Spot metering

EXPOSURE METER: Activated by lightly pressing shutter release button; stays on for approx. 8 sec. after lifting finger from button

EXPOSURE MODES: Programmed auto (PM, P), Shutter-Priority auto (S), Aperture-Priority auto (A) and Manual (M) modes

PROGRAMMED AUTO EXPOSURE CONTROL: Both shutter speed and aperture are set automatically; Flexible Program in one EV step increments possible

SHUTTER-PRIORITY AUTO EXPOSURE CONTROL: Aperture automatically selected to match manually set shutter speed

APERTURE-PRIORITY AUTO EXPOSURE CONTROL: Shutter speed automatically selected to match manually selected aperture

MANUAL EXPOSURE CONTROL: Both aperture and shutter speed are set manually

EXPOSURE COMPENSATION: Possible using exposure compensation button within ±5EV range in 1/3EV steps

AUTO EXPOSURE LOCK: Available by sliding the AE lock lever while the meter is on

AUTO EXPOSURE BRACKETING: 3 or 5 frames can be taken of the same subject using a variety of exposures (with compensation degree of 0.3, 0.7 or 1 EV between each frame)

SHUTTER: Electromagnetically controlled vertical-travel focal-plane shutter

SHUTTER RELEASE: Electromagnetic type

SHUTTER SPEEDS: Lithium niobate oscillator-controlled speeds from 1/2000 to 30 sec.; stepless in Programmed auto and Aperture-Priority auto exposure modes; one EV steps in Shutter-Priority auto and Manual exposure modes; Electromagnetically controlled long exposure at B setting

VIEWFINDER: Fixed eyelevel pentaprism high-eyepoint type; 0.75X magnification with 50mm lens at infinity; 92% frame coverage

EYEPOINT: Approx. 18mm

EYEPIECE COVER: Model DK-5 (provided) prevents stray light from entering viewfinder

FOCUSING SCREEN: Fixed Nikon advanced B-type BriteView screen with central focus brackets for autofocus operation

FILM SPEED RANGE: ISO 25 to ISO 5000 for DX-coded film; ISO 6 to ISO 6400 for manual setting

FILM SPEED SETTING: Auto for DX-coded films and manual setting available

SELF-TIMER: Electronically controlled; timer duration can be selected between 2 to 30 sec. in one sec. increments; blinking LED indicates self-timer operation; two-shot self-timer is possible; can cancel at any time

REFLEX MIRROR: Automatic, instant-return type

FLASH SYNC CONTROL: Normal sync, slow sync and rear-curtain sync provided

BUILT-IN TTL FLASH: Guide number: 13 (at ISO 100, 20 deg. C and meters); angle of coverage: 28mm lens or longer; TTL auto flash including automatic balanced Fill-Flash is possible

FLASH SYNCHRONIZATION: In Programmed auto or Aperture-Priority auto shutter operates 1/125 to 1/60 sec. {or 1/(focal length) in use at lens focal length less than 60mm} in normal sync or 1/125 to 30 sec. in slow sync; in Shutter-Priority auto or Manual exposure mode, shutter fires at speed set, and when set from 1/250 to 1/2000 sec., shutter is automatically set to 1/125 sec.

AUTOMATIC BALANCED FILL-FLASH: Possible with built-in TTL flash or Nikon-dedicated Speedlights such as SB-24, SB-23, S8-22, S8-20, SB-18 and SB-16B

MANUAL FLASH LIGHT OUTPUT COMPENSATION: Can be controlled from +1EV to -3EV in 1/3 step increments

FLASH READY-LIGHT: Without flash: Blinks when using flash is recommended (with scene brightness darker than EV10 at ISO 100 or scene brightness of EV10 or higher at ISO 100 where the center portion is darker than other areas by more than 1EV). With flash: Lights up when built-in TTL flash or Nikon dedicated Speedlight is ready to fire or blinks to warn of insufficient light for correct exposure

ACCESSORY SHOE: Standard ISO-type hot-shoe contact; ready-light contact, TTL flash contact, monitor contact

FILM LOADING: Film automatically advances to first frame when shutter release button is depressed once

FILM ADVANCE: In S (Single-frame) shooting mode, film automatically advances one frame when shutter is released; in CH (Continuous High) or CL (Continuous Low) shooting mode, shots are taken as long as shutter release button is depressed; in CH mode, shooting speed is approx. 2.0 fps, and in CL, approx. 1.2 fps

FRAME COUNTER: Additive type; counts back while film is rewinding

FILM REWIND: Automatically rewinds by sliding film rewind lever while pressing film rewind button; approx. 26 sec. per 36-exposure film roll or 19 sec. per 24-exposure film roll; stops automatically when film is rewound

CAMERA BACK: Hinged back; unchangeable

POWER SOURCE: 6V lithium battery pack (Duracell DL-223A/Panasonic CR-P2 or equivalent)

CHECKING BATTERY POWER: Battery power is sufficient if shutter speed and aperture indications appear on the LCD panel and viewfinder by turning camera on or by lightly pressing shutter release button, and remain on for approx. 8 sec. after finger is removed from the button; battery power is insufficient if these indications turn off immediately after finger is removed from the button; if LCD blinks and shutter does not operate, batteries are exhausted or improperly loaded

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Chromatic aberration

There are two kinds of chromatic aberration: longitudinal and lateral. Longitudinal chromatic aberration is a variation in location of the image plane with changes in wave lengths. It produces the image point surrounded by different colors which result in a blurred image in black-and-white pictures. Lateral chromatic aberration is a variation in image size or magnification with wave length. This aberration does not appear at axial image points but toward the surrounding area, proportional to the distance from the center of the image field. Stopping down the lens has only a limited effect on these aberrations.

Spherical aberration

Spherical aberration is caused because the lens is round and the film or image sensor is flat. Light entering the edge of the lens is more severely refracted than light entering the center of the lens. This results in a blurred image, and also causes flare (non-image forming internal reflections). Stopping down the lens minimizes spherical aberration and flare, but introduces diffraction.


Astigmatism in a lens causes a point in the subject to be reproduced as a line in the image. The effect becomes worse towards the corner of the image. Stopping down the lens has very little effect.


Coma in a lens causes a circular shape in the subject to be reproduced as an oval shape in the image. Stopping down the lens has almost no effect.

Curvature of field

Curvature of field is the inability of a lens to produce a flat image of a flat subject. The image is formed instead on a curved surface. If the center of the image is in focus, the edges are out of focus and vice versa. Stopping down the lens has a limited effect.


Distortion is the inability of a lens to capture lines as straight across the entire image area. Barrel distortion causes straight lines at the edges of the frame to bow toward the center of the image, producing a barrel shape. Pincushion distortion causes straight lines at the edges of the frame to curve in toward the lens axis. Distortion, whether barrel or pincushion type, is caused by differences in magnification; stopping down the lens has no effect at all.

The term "distortion" is also sometimes used instead of the term "aberration". In this case, other types of optical aberrations may also be meant, not necessarily geometric distortion.


Classically, light is thought of as always traveling in straight lines, but in reality, light waves tend to bend around nearby barriers, spreading out in the process. This phenomenon is known as diffraction and occurs when a light wave passes by a corner or through an opening. Diffraction plays a paramount role in limiting the resolving power of any lens.


Doublet is a lens design comprised of two elements grouped together. Sometimes the two elements are cemented together, and other times they are separated by an air gap. Examples of this type of lens include achromatic close-up lenses.

Dynamic range

Dynamic range is the maximum range of tones, from darkest shadows to brightest highlights, that can be produced by a device or perceived in an image. Also called tonal range.

Resolving power

Resolving power is the ability of a lens, photographic emulsion or imaging sensor to distinguish fine detail. Resolving power is expressed in terms of lines per millimeter that are distinctly recorded in the final image.


Vignetting is the darkening of the corners of an image relative to the center of the image. There are three types of vignetting: optical, mechanical, and natural vignetting.

Optical vignetting is caused by the physical dimensions of a multi-element lens. Rear elements are shaded by elements in front of them, which reduces the effective lens opening for off-axis incident light. The result is a gradual decrease of the light intensity towards the image periphery. Optical vignetting is sensitive to the aperture and can be completely cured by stopping down the lens. Two or three stops are usually sufficient.

Mechanical vignetting occurs when light beams are partially blocked by external objects such as thick or stacked filters, secondary lenses, and improper lens hoods.

Natural vignetting (also known as natural illumination falloff) is not due to the blocking of light rays. The falloff is approximated by the "cosine fourth" law of illumination falloff. Wide-angle rangefinder designs are particularly prone to natural vignetting. Stopping down the lens cannot cure it.


Bright shapes or lack of contrast caused when light is scattered by the surface of the lens or reflected off the interior surfaces of the lens barrel. This is most often seen when the lens is pointed toward the sun or another bright light source. Flare can be minimized by using anti-reflection coatings, light baffles, or a lens hood.


Glowing patches of light that appear in a photograph due to lens flare.

Retrofocus design

Design with negative lens group(s) positioned in front of the diaphragm and positive lens group(s) positioned at the rear of the diaphragm. This provides a short focal length with a long back focus or lens-to-film distance, allowing for movement of the reflex mirror in SLR cameras. Sometimes called an inverted telephoto lens.


A photographic lens completely corrected for the three main optical aberrations: spherical aberration, coma, and astigmatism.

By the mid-20th century, the vast majority of lenses were close to being anastigmatic, so most manufacturers stopped including this characteristic in lens names and/or descriptions and focused on advertising other features (anti-reflection coating, for example).

Rectilinear design

Design that does not introduce significant distortion, especially ultra-wide angle lenses that preserve straight lines and do not curve them (unlike a fisheye lens, for instance).

Focus shift

A change in the position of the plane of optimal focus, generally due to a change in focal length when using a zoom lens, and in some lenses, with a change in aperture.


The amount of light that passes through a lens without being either absorbed by the glass or being reflected by glass/air surfaces.

Modulation Transfer Function (MTF)

When optical designers attempt to compare the performance of optical systems, a commonly used measure is the modulation transfer function (MTF).

The components of MTF are:

The MTF of a lens is a measurement of its ability to transfer contrast at a particular resolution from the object to the image. In other words, MTF is a way to incorporate resolution and contrast into a single specification.

Knowing the MTF curves of each photographic lens and camera sensor within a system allows a designer to make the appropriate selection when optimizing for a particular resolution.

Veiling glare

Lens flare that causes loss of contrast over part or all of the image.

Anti-reflection coating

When light enters or exits an uncoated lens approximately 5% of the light is reflected back at each lens-air boundary due to the difference in refractive index. This reflected light causes flare and ghosting, which results in deterioration of image quality. To counter this, a vapor-deposited coating that reduces light reflection is applied to the lens surface. Early coatings consisted of a single thin film with the correct refractive index differences to cancel out reflections. Multi-layer coatings, introduced in the early 1970s, are made up of several such films.

Benefits of anti-reflection coating:

Circular fisheye

Produces a 180° angle of view in all directions (horizontal, vertical and diagonal).

The image circle of the lens is inscribed in the image frame.

Diagonal (full-frame) fisheye

Covers the entire image frame. For this reason diagonal fisheye lenses are often called full-frame fisheyes.

Extension ring

Extension rings can be used singly or in combination to vary the reproduction ratio of lenses. They are mounted between the camera body and the lens. As a rule, the effect becomes stronger the shorter the focal length of the lens in use, and the longer the focal length of the extension ring.

View camera

A large-format camera with a ground-glass viewfinder at the image plane for viewing and focusing. The photographer must stick his head under a cloth hood in order to see the image projected on the ground glass. Because of their 4x5-inch (or larger) negatives, these cameras can produce extremely high-quality results. View cameras also usually support movements.

135 cartridge-loaded film

43.27 24 36
  • Introduced: 1934
  • Frame size: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm
  • Area: 864mm2
  • Double perforated
  • 8 perforations per frame

120 roll film

71.22 44 56
  • Introduced: 1901
  • Frame size: 56 × 44mm
  • Aspect ratio: 11:14
  • Diagonal: 71.22mm
  • Area: 2464mm2
  • Unperforated

120 roll film

79.2 56 56
  • Introduced: 1901
  • Frame size: 56 × 56mm
  • Aspect ratio: 1:1
  • Diagonal: 79.2mm
  • Area: 3136mm2
  • Unperforated

120 roll film

89.64 56 70
  • Introduced: 1901
  • Frame size: 70 × 56mm
  • Aspect ratio: 5:4
  • Diagonal: 89.64mm
  • Area: 3920mm2
  • Unperforated

220 roll film

71.22 44 56
  • Introduced: 1965
  • Frame size: 56 × 44mm
  • Aspect ratio: 11:14
  • Diagonal: 71.22mm
  • Area: 2464mm2
  • Unperforated
  • Double the length of 120 roll film

220 roll film

79.2 56 56
  • Introduced: 1965
  • Frame size: 56 × 56mm
  • Aspect ratio: 1:1
  • Diagonal: 79.2mm
  • Area: 3136mm2
  • Unperforated
  • Double the length of 120 roll film

220 roll film

89.64 56 70
  • Introduced: 1965
  • Frame size: 70 × 56mm
  • Aspect ratio: 5:4
  • Diagonal: 89.64mm
  • Area: 3920mm2
  • Unperforated
  • Double the length of 120 roll film

Shutter speed ring with "F" setting

The "F" setting disengages the leaf shutter and is set when using only the focal plane shutter in the camera body.

Catch for disengaging cross-coupling

The shutter and diaphragm settings are cross-coupled so that the diaphragm opens to a corresponding degree when faster shutter speeds are selected. The cross-coupling can be disengaged at the press of a catch.

Cross-coupling button

With the cross-coupling button depressed speed/aperture combinations can be altered without changing the Exposure Value setting.

M & X sync

The shutter is fully synchronized for M- and X-settings so that you can work with flash at all shutter speeds.

In M-sync, the shutter closes the flash-firing circuit slightly before it is fully open to catch the flash at maximum intensity. The M-setting is used for Class M flash bulbs.

In X-sync, the flash takes place when the shutter is fully opened. The X-setting is used for electronic flash.

X sync

The shutter is fully synchronized for X-setting so that you can work with flash at all shutter speeds.

In X-sync, the flash takes place when the shutter is fully opened. The X-setting is used for electronic flash.

Unable to follow the link

You are already on the page dedicated to this lens.

Cannot perform comparison

Cannot compare the lens to itself.

Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.


Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),


CF – crop-factor of a sensor,
FL – focal length of a lens.


A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Leica, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance (distance from the mechanical rear end surface of the lens mount to the focal plane) is also different.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.


The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. Magnification is expressed as a ratio. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Manual diaphragm

The diaphragm must be stopped down manually by rotating the detent aperture ring.

Preset diaphragm

The lens has two rings, one is for pre-setting, while the other is for normal diaphragm adjustment. The first ring must be set at the desired aperture, the second ring then should be fully opened for focusing, and turned back for stop down to the pre-set value.

Semi-automatic diaphragm

The lens features spring mechanism in the diaphragm, triggered by the shutter release, which stops down the diaphragm to the pre-set value. The spring needs to be reset manually after each exposure to re-open diaphragm to its maximum value.

Automatic diaphragm

The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.

Fixed diaphragm

The aperture setting is fixed at F/ on this lens, and cannot be adjusted.

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.


Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front lens element over multi-coatings.


Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.


Teleconverters increase the effective focal length of lenses. They also usually maintain the closest focusing distance of lenses, thus increasing the magnification significantly. A lens combined with a teleconverter is normally smaller, lighter and cheaper than a "direct" telephoto lens of the same focal length and speed.

Teleconverters are a convenient way of enhancing telephoto capability, but it comes at a cost − reduced maximum aperture. Also, since teleconverters magnify every detail in the image, they logically also magnify residual aberrations of the lens.

Lens caps

Scratched lens surfaces can spoil the definition and contrast of even the finest lenses. Lens covers are the best and most inexpensive protection available against dust, moisture and abrasion. Safeguard lens elements - both front and rear - whenever the lens is not in use.