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Mir 20mm f3.5 M42. Flange focal distance?
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PostPosted: Wed Apr 03, 2019 1:06 pm    Post subject: Mir 20mm f3.5 M42. Flange focal distance? Reply with quote
I want to buy one of these lenses and need to know which adapter which will be best for using with a Sony A7 camera?


PostPosted: Wed Apr 03, 2019 2:23 pm    Post subject: Reply with quote
Any m42 to E-mount adapter will be fine.


PostPosted: Thu Apr 04, 2019 10:57 am    Post subject: Reply with quote
fuzzywuzzy wrote:
Any m42 to E-mount adapter will be fine.


Not those designed for mounting helicoids, there are quite a few special short models available now, which only add distances between 1mm & 6mm.
The flange distance for M42 is 45.46mm so a standard adapter will be nearly 30mm long.


PostPosted: Thu Apr 04, 2019 12:11 pm    Post subject: Reply with quote
fuzzywuzzy wrote:
Any m42 to E-mount adapter will be fine.

This is not true.

I have three and every one of them has different length.
Haven't seen this magnitude of error with adapters for any other legacy systems.


PostPosted: Thu Apr 04, 2019 9:47 pm    Post subject: Reply with quote
The register distance (distance from flange to film plane) is 45.46mm.


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