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Settings etc
I did try at f1.8 and the coma was not good (you would have to crop the outer 25%) so I went down to f4 in the end to get a good result but I could have lived with f2.8 and a little cropping - this lens is much sharper than the supplied Canon 18-55 zoom , yes it needs an adapter - mine cost $13.50 on ebay. The adapter had to be insulated to stop it confusing the 20d electronics and then you work in M or appature priority (metering mode). Of course you have to set the lens to manual also. None of this is an issue for astro work. Next up - a Zeiss 135 f3.5 on its way for the uk for $80...
Thanks to Itchy for the idea!
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