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02-26-2012, 02:54 PM   #1
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DSLRs and Pentax-M lenses

Hello, I am new to this forum and have a question about digital cameras and manual lenses. When my father passed away he left me his Pentax MESuper and the following lenses:

Tokina AT-X 28-85mm lens, an SMC PentaX-M 28mm, SMC Pentax-M 200mm

I used them a bit years ago but was now wondering if they could be used on a digital camera body.

Thanks!


02-26-2012, 02:57 PM   #2
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These lenses can be used on all Pentax DSLRs directly with SR (but in M exposure mode), or on Canon APS-C DSLRs via adaptor.
02-26-2012, 03:37 PM   #3
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To clarify a bit. wlachlan mentions Pentax and Canon DSLRs because they are the digital SLR cameras that could use them. They could also be used, with adaptors, on a number of mirror-less digital cameras (Pentax-Q, Pentax K-01, Nikon-1, micro-4/3rds, Samsung NX, Sony NEX). Nikon DSLR could use K lenses with an adapter, but that has to include an optical lens which makes the adapter working as a really bad converter, and degrades the image.

With the DSLR options, note that with Pentax DSLRs you get motion stabilisation with all lenses since it is part of the sensor, while the Canons will not give you any shake reduction (they do it in some of their lenses by moving the optical elements instead of moving the sensor). In addition the Pentax DSLRs will give you focus confirmation (a beep and focus sensor indicators in the viewfinder), while I believe that the Canon DSLRs require a special and more expensive adapter with a chip in it to give focus confirmation. While you have to set the Pentax DSLR on "M" (for Manual) when exposing with these lenses, you can meeter with them pressing a separate button which makes the camera close down the aperture in the lens and meeter the correct exposure. How and if a Canon would meeter with a K mount lens as yours (with adapter) I don't know. The same goes for the mirrorless options. They all require some adapter, and hence they are likely to have limitations in how you can get help with focus and exposure. You better research this before buying.

Also worth considering is that the Pentax DSLRs and those of the Canon DSLRs that can take K mount lenses are all APS-C sensors. Compare to when using your lenses on the film bodies they were designed for this means some cropping. The 200mm will show as much of the world as a 300mm would have shown on a film camera, and the 28mm as much as a 42mm lens would have. This can be bad....the 28mm will not be a wide angle any longer, or good...if you want more of a tele effect on the tele lens. However, most of the mirror less cameras will have smaller sensors and give even more cropping of the original angle that the lenses could show. If it is good or bad is up to the application, the lens and to you.
02-27-2012, 08:25 AM   #4
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Thank you so much for all of the information. Any input on which Pentax would be best for a novice?

02-27-2012, 08:46 AM   #5
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Any Pentax DSLR will work with your lenses - read up on the different models in the camera reviews section.
Also, required reading for using your manual lenses with a DSLR: https://www.pentaxforums.com/forums/pentax-beginners-corner-q/110658-using-ma...x-dslrs-f.html
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