Sat Nov 03, 2018 12:03 am
Just picked up a Jupiter 21M f4-200mm from Russia. This had an M42 mount and I had to get creative to convert it over to PL mount. These Jupiter 21's won't focus properly when you put a screw on M42 to PL adapter. The rear housing has to be shortened by 38mm to allow focus to infinity.
I am very pleased with my quick test results on the big Ursa. The lens was at f5.6 and just had a UV IR Cut filter, no ND filter on an overcast day.
- Attachments
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![Jupiter 21M 200_2_1.16.1.jpg](./download/file.php?id=18946&sid=2990ee4e89a5f9d7553755a1c915de4d)
- Jupiter 21M 200_2_1.16.1.jpg (75.66 KiB) Viewed 13538 times
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![IMG_20181102_182953.jpg](./download/file.php?id=18945&sid=2990ee4e89a5f9d7553755a1c915de4d)
- IMG_20181102_182953.jpg (435.77 KiB) Viewed 13538 times
Last edited by
Thomas Koveleskie on Sat Nov 03, 2018 4:53 pm, edited 1 time in total.
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