Timeline for Decrease FF lens focal length for use on APS-C and still have it focus?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Jan 14, 2022 at 18:07 | comment | added | rackandboneman | Oh, one thing I forgot in my comment: I assumed you mean the "M39 mount with almost-M42 flange distance" that is not uncommon with russian SLR lenses. Though, surprisingly (comment edited) I see that M39 rangefinder focal reducers also seem to exist now. | |
| Jan 14, 2022 at 15:43 | comment | added | xiota | @LilBro This answer is correct, use a focal reducer, if one exists for the mount combination. If no focal reducer is available, you would end up having to redesign the lens, which isn't practical or cheap. | |
| Jan 13, 2022 at 1:11 | comment | added | rackandboneman | No problem. Minolta MD mount or EF or whatever short-enough mount speed booster, M42 adapter to that mount, M39-M42 ring. Obviously, infinity-focus issues with some russian M42/M39 lenses that would also show up with a normal M42 adapter will still be there | |
| Jan 12, 2022 at 22:39 | comment | added | LilBro | Its m39 and m42 mounts for lenses made in USSR they dont make speed boosters for those. | |
| Jan 12, 2022 at 11:19 | history | answered | rackandboneman | CC BY-SA 4.0 |