GC-FineArt wrote:
I use several different legacy Pentax and Soviet Era lenses; Takumars, Pentax SMCs, CZJs, Jupiters, Helioss, etc., with both K- and M42-mounts, on
my K20D. And, in fact, a number of these were original equipment on non-Pentax SLRs (mostly Prakticas and Zenits).
Ive also used older Minolta lenses with a proper adapter, i.e one which has the additional optical element to compensate for register differences; and even Dekel-mount Schneiders using an M42+DKL combo setup.
Without getting into all the nitty-gritty details, one thing I might note is that are a few M42s which, while they can be mounted, are essentially unusable on any DSLR -- Pentax or otherwise -- as far as I know. These are the Semi-Auto lenses like my Takumar 35/2.3 pictured below.
The Semi auto M42s were a brief evolutionary stage between the completely manual stop-down and manual pre-set lenses, and the fully auto stop-down lenses. You can usually spot them by the prominent cocking lever used to charge the stop-down mechanism (red arrow in the photo). There arent very many of them around and I have no idea if you have any in your collection. Just thought Id mention this devilish detail.
I use several different legacy Pentax and Soviet ... (
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I have two 'pre-set' lens that I use on my PENTAX istDL, which has the screw mount adapter. The pre-set lever opened the iris to maximum for focusing on the film camera; you can not use it on the digital camera because there is no means of stopping down. Just ignore the 'pre-set' lever, push the 'stop down pin' before installing lense, then adjust aperture as desired.