m42 lenses
1) Manual only (usually a pre-set aperture like the Jupiter-9 etc)
2) Manual and Auto (set by a switch on the lens barrel)
3) Auto only (actually quite rare but applies to later versions of the Helios-44)
If you have a lens that falls into (1) or (2) then it's quite simple to set the aperture, I'd say 90%+ of all M42 lenses fall in these groups.
If you have a lens that falls into (3) then you need to find a way of keeping the pin permenantly depressed - some use glue (which then permanently alters the lens) others may take the back off and use a spacer (reversible if the need ever arises).
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14 years
stroud,glos
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