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Old 02-09-2019, 09:54 AM
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Astrofriend (Lars)
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Join Date: Aug 2017
Location: Stockholm, Sweden
Posts: 221
First light with Canon 300 mm lens f/4.

At last we got some darkness so I could test my "new" Canon 300 mm f/4 lens. I used my Star Adventurer mount and didn't had very big expectations about the result. But it worked very well, this is nice, it's like a small telescope. Easy to bring with you on travel. No problem to adapt field flatter. Built in focus motor that I can remote control from my smartphone.

See here:
http://www.astrofriend.eu/astronomy/...31-galaxy.html

It was a lot of things that went wrong this night, but I got 44 minutes of exposures. Next time, better polar align and better focus.

At the bright stars there are some blue bleeding, I have seen that on other 300 mm lenses too. Maybe less when I focus it better.

/Lars
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