|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|
|FISH-EYE||An ultra-wide angle lens with strong uncorrected barrel distortion and extreme 180-degree angle of view.|
|■Asahi Fish-eye-TAKUMAR 17mm F/4 ||A||11 - 7||0.2m||--||1967 ●|
|■Asahi Super-Multi-Coated Fish-eye-TAKUMAR 17mm F/4  [Mod. M42]||A||11 - 7||0.2m||--||1973 ●|
|■smc Pentax 17mm F/4 Fish-eye||A||11 - 7||0.2m||--||1975 ●|
|Maximum format:||35mm full frame|
|Mount and Flange focal distance:||Pentax K [45.5mm]|
|Lens construction:||11 elements - 7 groups|
|Aperture control:||Aperture ring (Manual settings only)|
|Number of blades:||6 (six)|
|Closest focusing distance:||0.2m|
|Maximum magnification ratio:||<No data>|
|Focusing modes:||Manual focus only|
|Manual focus control:||Focusing ring|
|Maximum diameter x Length:||⌀64.5×34mm|
|Super Protect (SP) coating:||-|
|Filters:||Removable front filters are not accepted|
|Built-in L39 (UV), Skylight, O56 (O2), Y48 (Y2) (part of the lens optical system)|
|Additional features:||Rear gelatin filter holder|
|Lens hood:||Built-in petal-shaped|
|In terms of FoV & DoF|
|Camera series [Crop factor]||Focal length||Speed||Dia. angle of view|
|Pentax K APS-C [1.53x]||26mm||F/6.1||79.5°|
The fisheye lens is an invaluable tool for the creative photographer. Characteristics enjoyed by professional photographers include its exaggerated perspective, incredible depth-of-field and ability to bend straight lines. SMC Pentax Fish-Eye 17mm f/4 has an enormous 180° angle of view which enables it to engulf the tallest building or most expansive landscape. Its compact size and four built-in filters are so attractive features, as well as its provision to accept gelatin filters at the rear.
The world's most efficient fish-eye lens with a maximum brightness of f/4. The angle of vision is approx. 180 degrees, enabling you to view and focus through the viewfinder without keeping the reflex mirror flipped up.
Attractive features of the SMC Pentax 17mm f/4 Fish-Eye include its extremely compact size and close focusing ability of 20cm. Moreover, it has four built-in filters (UV, Skylight, Y2, 02) which can instantly be dialed into place. Gelatine filters can also be slipped into the built-on gelatine filter holder at the rear of the lens.
A fisheye lens is a type of ultra-wide angle lenses with extreme 180 degree angle of view. Unlike conventional wide-angle lenses, fisheyes are not corrected for distortion - strong barrel distortion is a characteristic of all lenses of such class.
Fisheye lenses are normally used for specialized purposes and unusual special effects in advertising, commercial, scientific, surveillance, meteorologic and astronomic photography, but also popular for shooting extremely wide landscapes, interiors, action sports and even funny close-up portraits.
There are two types of fisheye lenses:
Scientific photography • Industrial photography
The lens can be adapted to Canon EOS digital SLR cameras, Sony digital SLR/SLT cameras. It is not possible to adapt this lens to Nikon digital SLR cameras due to shorter flange focal distance of the lens mount. For more information, please refer to the dedicated article.
First generation of smc Pentax bayonet mount lenses introduced together with Pentax K2, KX and KM 35mm film SLR cameras. They go from an ultra-wide 15mm to a super-telephoto 1000mm, and most of them were based on the SMC Takumar lenses. All of the lens elements were Super-Multi-Coated, even those elements that were cemented together. This increased the light transmission and color fidelity of the lenses while reducing flare and glare even better than the SMC Takumar lenses.
A number of other changes and improvements were also made. All lenses had textured rubber focusing rings for a better grip. The minimum aperture of all the lenses had also been changed. The Pentax lenses no longer had a stop-down lever and when the lens was removed from the camera body it closed down to the set aperture.
With an inner diameter of 45mm, the Pentax K mount can easily handle fast lenses like the smc Pentax 50mm F/1.2. It is extremely quick and easy to change lenses. The auto diaphragm and full aperture metering are coupled as you twist the lens.
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Cannot compare the lens to itself.
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.
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 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, 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 – 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.
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.
The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.
The distance from the front edge of the lens to the subject at the maximum magnification.
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".
The diaphragm must be stopped down manually by rotating the detent aperture ring.
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.
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.
The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.
The aperture setting is fixed at F/4 on this lens, and cannot be adjusted.
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.).
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.
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.
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.
Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.
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.
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.