smc Pentax-FA 645 120mm F/4 Macro

Macro lens • Digital era

SMC The multi-layer coating is applied to the surface of lens elements. It boosts light transmission, ensures sharp and high contrast images, minimizes ghosting and flares.
FA Autofocus lens with mechanical coupling with camera and MTF program line support.
MACRO Macro lens. Designed specially for shooting close-ups of small subjects but can be also used in other genres of photography, not necessarily requiring focusing at close distances.

Model history

smc Pentax-FA 645 120mm F/4 Macro6x4.51:1A9 - 70.395m⌀67 2014 
smc Pentax-A 645 120mm F/4 Macro6x4.51:1A9 - 70.39m⌀67 1986 

Pentax 645N

Medium format AF film SLR camera

Announced:1997
Mount:Pentax 645
Format:56 × 41.5mm
Shutter type:Focal-plane
Shutter model:Electronically controlled
Speeds:4 - 1/1000 + B
Exposure metering:Through-the-lens (TTL)
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Manual
Dimensions:147x109x117mm
Weight:1280g

Pentax 645NII

Medium format AF film SLR camera

Announced:2001
Mount:Pentax 645
Format:56 × 41.5mm
Shutter type:Focal-plane
Shutter model:Electronically controlled
Speeds:6 - 1/1000 + B
Exposure metering:Through-the-lens (TTL)
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Manual
Dimensions:147x109x117mm
Weight:1280g

Pentax 645D

Medium format AF digital SLR camera

Announced:2010
Mount:Pentax 645
Format:44 × 33mm
Resolution:7264 × 5440 - 40 MP
Sensor type:CCD
Shutter type:Focal-plane
Shutter model:Electronically controlled
Speeds:30 - 1/4000 + B
Exposure metering:Through-the-lens (TTL)
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Manual
Image stabilizer:-
Dimensions:156x117x119mm
Weight:1400g

Pentax 645Z

Medium format AF digital SLR camera

Announced:2014
Mount:Pentax 645
Format:44 × 33mm
Resolution:8256 × 6192 - 51 MP
Sensor type:CMOS
Shutter type:Focal-plane
Shutter model:Electronically controlled
Speeds:30 - 1/4000 + B
Exposure metering:Through-the-lens (TTL)
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Manual
Image stabilizer:-
Dimensions:156x117x123mm
Weight:1470g

Features highlight

6x4.5
F.E.
8 blades
Macro 1:1
Body AF
Focus Clutch
Focus limiter

Specification

Production details
Announced:April 2014
Production status:In production
Production type:Mass production
Original name:SMC PENTAX-FA 645 MACRO 1:4 120mm
Optical design
Focal length:120mm
Speed:F/4
Maximum format:Medium format 6x4.5
Mount:Pentax 645
Diagonal angle of view:32.4° (Medium format)
25.7° (Medium format (cropped frame))
Lens construction:9 elements - 7 groups
Floating element system
Diaphragm mechanism
Number of blades:8
Focusing
Closest focusing distance:0.395m
Maximum magnification ratio:1:1 at the closest focusing distance
Focusing method:<No information>
Focusing modes:Autofocus, manual focus
Manual focus control:Focusing ring
Autofocus motor:In-camera motor
Focus mode selector:Focus Clutch Mechanism
Quick-Shift Focus System (QFS):-
Focusing distance range limiter:FULL;LIMIT
Shake Reduction (SR)
Built-in SR:-
Physical characteristics
Weight:735g
Maximum diameter x Length:⌀82.5×110mm
Weather sealing:-
Super Protect (SP) coating:-
Accessories
Filters:Screw-type 67mm
Lens hood:Bayonet-type PH-RBD (round, with filter access window)

Manufacturer description

This is a macro lens that enables 1:1 shooting at a minimum shooting distance of 39.5cm. This lens uses a floating mechanism, independently-moving aperture mechanism, extraordinary-low dispersion glass, and other features. This enables effectively correcting of various types of aberration for obtaining sharp digital images with high contrast from the infinity end to the minimum shooting distance. This is a medium telephoto macro lens with a wide working distance for capturing the intensity of closeups of flowers or insects in outdoor settings. The focus limiter can be used to set the focusing distance range for increasing the speed of the autofocus.

Typical application

portraits, travel, macrophotography and product photography

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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm

Travellers' choice

Note

Among autofocus lenses designed for 35mm full-frame mirrorless cameras only. Speed of standard and telephoto lenses is taken into account.

Professional lens (Top class)

One of the best short telephoto macro primes

According to lens-db.com; among lenses designed for the same maximum format and mount.

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Quality control issues

The manufacturer of this lens does not provide adequate quality control. If you do decide to purchase this lens, do not order it online, but choose the best copy available in the store. In any case, there may also be problems with the build quality, and warranty repairs can take months.

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.

In-camera motor

Focusing distance range limiter

The lens features focusing distance range limiter which allows to choose between the following focusing distance ranges:

FULLFull range of focusing distances.
LIMITRange of focusing distances suitable for shooting nearby subjects.

By setting the suitable focusing distance range, the actual autofocusing time can be shorter.

Focus Clutch Mechanism

Focus Clutch Mechanism allows the photographer to switch between AF and MF simply by snapping the focus ring forward for AF and back toward the camera to focus manually.

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

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),

where:

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

Mount

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, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be 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.

Flange focal distance

The flange focal distance (FFD), sometimes called the "flange back", is the distance from the mechanical rear end surface of the lens mount to the focal plane.

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.

Speed

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.

Floating element system

Provides correction of aberrations and ensures constantly high image quality at the entire range of focusing distances from infinity down to the closest focusing distance. It is particularly effective for the correction of field curvature that tends to occur with large-aperture, wide-angle lenses when shooting at close ranges.

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. 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.

Electromagnetic diaphragm control system

Provides highly accurate diaphragm control and stable auto exposure performance during continuous shooting.

Convex protruding front element

The convex front element protrudes from the lens barrel, making it impossible to use filters.

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.

Weight

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 and/or rear lens elements over multi-coatings.

Filters

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.