Nice photo. Ivan, did you have any issues with astigmatism (triangular stars) on this lens? How does it perform in winter, did you modify it, loosen the mirror and meniscus mountings?
Astigmatism was present. I almost completely loosened the mirror and meniscus mountings, and it became normal. Last winter, we didn't have severe frosts, so there were no issues.
13 Sep, 2020
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