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Pentax SMC Fish-Eye 1:4 / 17mm

K mount version of the previous M42. High quality pancake lens

he complex 11 elements in 7 groups for such a small lens.

It is a small lens, intruduced in 1975, to replace the M42 version, adding Pentax SMC coating and a minimal hood to hold a 65mm metal slip-on cap. It has a filter turret with Y48(Y2), Skylight, none, L39(UV), O56(O2).
There are two versions, seems only the capital letter of the SMC in the name is changing:

1975 SMC PENTAX FISH-EYE 1:4/17 cat.number 21240
1977 smc PENTAX FISH-EYE 1:4/17 cat.number 21240

The slip-on cap is the 58mm one, the same one you can find on the first version of 28mm 3.5 M42 and on other Pentax lenses of the same age.

Digital use:
First of all, any Pentax or Samsung-Pentax mount D-SLR can use this lens, as the M42 previous version, with the M42 adapter. On Canon EOS cameras, with an adapter you can find easily on eBay, you can mount the lens… but a caveat! Pentax K aperture pin may protrude inside the camera and should be removed… could prevent you from mounting the lens, as well could be in the clearance of the mirror path if you use a full-frame camera. No problem with any mirrorless.


Lens info
Focal Length:
Camera Format:
Lens Type:
Lens FOV:
Lens Mount:
Lens Hood:
Filter Type:
Built In
Lens Elements / Groups:
11 / 7
Image Circle:
64 x 34 mm
234 g
Years Manufactered:

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