using old pentax film SLR lenses with a DSLR camera body

Started Mar 28, 2011 | Discussions thread
hanhait Senior Member • Posts: 1,242
Re: using old pentax film SLR lenses with a DSLR camera body

As for the crop factor: Pentax lenses will work on the K-x and all other digital bodies currently sold, as if they had a 1.5x longer focal length. So a 50 mm lens will look like a 75 mm on film when using it on a ASP-C DSLR (but it 'is' still a 50 mm).

For the lens types:

  • they will work - with some limitations - on all Pentax APS-C camera's on the market and older models (K-100D, *ist-D etc)

Limitations are:

  • for -M lenses: no autofocus, no automatic diaphragm, but Pentax has a tric for setting the shutter time once you selected the diaphragm. Also you can still use the focus-indicator.

  • For -A lenses: the automatic exposure works fully

  • For -FA and newer lenses: both autofocus and exposure work fully.

To buy a K-x just for this purpose when you have already the Sony 'm not sure I would recommend, but if you have joy already just in the feeling of re-using the old glass then you will not be disappointed. You can also look for an older second-hand model.

 hanhait's gear list:hanhait's gear list
Pentax K100D Pentax K-5 Tamron SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical (IF) Pentax smc D-FA 100mm F2.8 Macro WR Sigma 70-300mm F4-5.6 APO DG Macro +9 more
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