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Old 15-02-2021, 03:27 PM
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Astrofriend (Lars)
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Join Date: Aug 2017
Location: Stockholm, Sweden
Posts: 334
I have now done some test with the Canon 300 mm lens, very satisfaid with the result. Time to replace it with the Pentax 645 lens. When I did this I got one problem, the focus barrel on this lens runs backwards.

My project report:
http://www.astrofriend.eu/astronomy/...645-300ed.html

It wasn't a clear sky this night, have to wait until I get that and can do some test.

All these tests I do now are done from a very light polluted sky. But I can still see the shape of the stars, vigenneting etc to judge how the lens perform.

Lars
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