Quote:
Originally Posted by RB
Jeremy I've used my 85mm f/1.2 for astro.
The thing I've found is that it's absolutely critical to get focus spot on else you get this happening.
I see it when using live view and it's very very difficult to get focus spot on.
Also focus can shift throughout the session as temps drop so you need to re-check it now and then.
I also stop it down a couple of stops.
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Testing the advice - good stuff!!
At last a clear night. Yes! focusing on these lenses is critical. This is my latest attempt: The LMC in 15 sec. exposure at iso200
http://lh6.ggpht.com/_nmcM5hLJalE/TP...s576/comet.jpg
http://lh5.ggpht.com/_nmcM5hLJalE/TP...8/s512/lmc.jpg
and Comet Hartley 103P in 10 sec at iso 200.