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12-02-2019, 03:05 AM   #1
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Pentax K bayonet mount with contacts

Need some help pls is this mount for pentax , anyone have any idea ? its a sigma mini wide II 28mm 2.8 lens

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12-02-2019, 04:10 AM - 1 Like   #2
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I have the sister to that lens, the Super-Wide II 24mm and it looks nothing like that; there's a bayonet, but the contacts are all wrong...

it does not look like a K-mount lens from here....
12-02-2019, 04:21 AM - 1 Like   #3
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It looks like a Practica B-mount (a.k.a PB-mount).
12-02-2019, 10:09 AM - 1 Like   #4
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Welcome to the Pentax Forums! As user @Markkuk noted above, the mount is Praktica B with a flange focal distance of 44mm* (shorter than M42 and Pentax-K). The lens is not adaptable to Pentax-K without additional optical elements and I am unaware of any successful attempts at a "surgical" solution to allow use on a K-mount camera.


Steve

* 44.4mm by some sources


Last edited by stevebrot; 12-02-2019 at 10:16 AM.
12-02-2019, 10:25 AM   #5
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Questions about Praktica B (PB-mount) lenses go back a long way on this site with the most recent being just this last summer. A Google search using the following search term will provide a partial list, "praktica b site:www.pentaxforums.com".


Steve
12-03-2019, 01:31 AM   #6
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thank you everyone for the quick responds you posts have helped me out , yes its a pb mount on the sigma 28, someone has attempted to do some modifications on the lens
12-03-2019, 06:37 AM   #7
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possible to convert Praktica B to PK

Hi

I have converted a Prakticar 2,8/135 MC with Praktica B mount to Pentax K. Check here http://percipa.com/foto/DIY objektiv/Prakticar 2,8:135/Prakticar 2,8_135 MC.html

I do not know if it is possible to convert your Sigma. Probably it wold work as long as you can adjust infinity with the focusing ring. There is a difference in the flange distance. The optics must com closer to the sensor.

Livio
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