smc Pentax Reflex 400-600mm F/8-12

Telephoto zoom lens • Film era • Discontinued

Abbreviations

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. Learn more

Production details

Announced:February 1982
Production type:<No data>
Production status: Discontinued
Original name:ASAHI OPT. CO. SMC PENTAX REFLEX ZOOM 1:8~12 400~600mm
System:Pentax K (1975)

Features highlight

M/R
Fixed
MF
⌀67
filters
TC

Specification

Optical design
Focal length range:400mm - 600mm [1.5X zoom ratio]
Speed range:F/8 @ 400mm - F/12 @ 600mm
Maximum format:35mm full frame
Mount and Flange focal distance:Pentax K [45.5mm]
Diagonal angle of view:6.2° @ 400mm - 4.1° @ 600mm
Lens construction:12 elements - 7 groups
Diaphragm mechanism
Diaphragm type:Fixed
Aperture control:None
Number of blades:-
Zooming
Zoom mechanism:Manual
Zoom control:Zoom ring
Zoom type:Rotary
Zooming method:Extends while zooming
Focusing
Closest focusing distance:3m
Maximum magnification ratio:1:2.5 @ 600mm at the closest focusing distance
Focusing modes:Manual focus only
Manual focus control:Focusing ring
Physical characteristics
Weight:730g
Maximum diameter x Length:⌀82×108mm
Weather sealing:-
Super Protect (SP) coating:-
Accessories
Filters:Screw-type 67mm
Screw-type 40.5mm (rear)
Lens hood:Screw-type H-R67 (round)
Teleconverters:Pentax Rear Converter-A 1.4X-L → 560-840mm F/11.2-16.8
Pentax Rear Converter-A 2X-S → 800-1200mm F/16-24

*) Sources of data: Manufacturer's technical data ● smc Pentax-A lenses operating manual ● Pentax 35mm SLR lenses (September 1989) ● Pentax 35mm interchangeable lenses operating manual (August 2003) ● Pentax lenses & accessories booklet (December 1986) ● Pentax 35mm SLR lenses ● Pentax MG booklet (PUB. 06221) (July 1983) ● Pentax cameras booklet (PUB. 06091, 40 pages) (March 1987) ● Pentax SLR cameras booklet (PUB. 050101) (September 1988) ● Pentax cameras booklet (PUB. 06091, 32 pages) ● Pentax ZX-M booklet ● Pentax lenses and accessories booklet (PUB. 06771) (April 1983) ● Pentax lenses & accessories - A Comprehensive and Versatile Photographic System booklet.

35mm equivalent focal length range and speed (on APS-C cameras)

In terms of FoV & DoF
Camera series [Crop factor] Focal length SpeedMax MR Dia. angle of view
Pentax K APS-C [1.53x] 612mm - 918mm F/12.2 @ 400mm - F/18.4 @ 600mm1:1.63 4° @ 400mm - 2.7° @ 600mm

Manufacturer description #1

The new Pentax 400mm - 600mm Super Telephoto Zoom, with virtually the same dimensions as a conventional 35mm - 70mm zoom, is so small and lightweight you can pan the horizon with amazing swiftness, as you cup the lens in your hand. It also focuses as close as three meters for exciting and dramatic close ups.

Manufacturer description #2

A compact and lightweight reflex design makes this an ideal lens for hand-held sports and landscape shots. The reflex design also ensures reduced chromatic aberrations and sharp images at all times.

Manufacturer description #3

Thanks to a reflex optical design, this extremely compact, lightweight super-telephoto zoom lens measures only 10cm in length. The reflex design also ensures reduced chromatic aberration and sharp images at all focal lengths plus a minimum focusing distance of 3m. Exposure is controlled by three screw-on ND (neutral density) filters and shutter speed variation. Screw-on skylight, Y2 and R2 filters are also provided. This is an excellent lens for hand-held shooting of moving subjects in sports and action photography.

Typical application

Class:

Slow full-frame telephoto zoom lens • Mirror/Reflex lens

Mirror/Reflex lens

A lens based on design principles used in large astronomical telescopes. It is a combination of mirror and lens elements. Incoming light is reflected twice on the mirror surfaces, resulting in compactness of the lens barrel and light weight relative to the focal length.

To adjust image brightness, neutral density or other filters are used, because lenses of this type are not equipped with diaphragms.

Sharpness of the focused image is unsurpassed because of the use of reflecting surfaces which do not cause any chromatic aberration.

Taken with this type of lens, the subjects in the out-of-focus range may appear as blurred rings or separate blurred lines.

Genres or subjects of photography (4):

Distant subjects • Distant landscapes with perspective compression effect • Wild nature • Travel photography

Adaptation to digital SLR cameras:

Canon EOS SLRsSony SLRs/SLTsNikon SLRsMore information

Not adaptable

In order to adapt the lens, the flange focal distance (FFD) of the lens mount must be equal to or greater than the FFD of the camera mount. This lens has the Pentax K mount with a FFD of 45.5mm. This is even shorter than the FFD of Canon EOS digital SLR cameras, which have the shortest FFD of 44mm of any modern digital SLR cameras. Therefore, this lens cannot be adapted to any digital SLR camera.

Recommended slowest shutter speed when shooting static subjects handheld:

1/640th of a second @ 600mm • 1/400th of a second @ 400mm

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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm
  • Area: 864mm2

MF

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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

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 can also be different.

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

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.

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.

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 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/8 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.

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.

Teleconverters

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.

Rotary zoom

The change of focal length is achieved by turning the zoom ring and the manual focusing - by turning the separate focusing ring.

Push/pull zooming allows for faster change of focal length, however conventional method based on the rotation of the zoom ring provides more accurate and smooth zooming.

Push/pull zoom

The change of focal length happens when the photographer moves the ring towards the mount or backwards.

Push/pull zooming allows for faster change of focal length, however conventional method based on the rotation of the zoom ring provides more accurate and smooth zooming.

Zoom lock

The lens features a zoom lock to keep the zoom ring fixed. This function is convenient for carrying a camera with the lens on a strap because it prevents the lens from extending.

Zoom clutch

To set the manual zoom mode, pull the zoom ring towards the camera side until the words "POWER ZOOM" disappear.