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Old 17-03-2012, 06:21 AM
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leon is offline
Join Date: Apr 2006
Location: ballarat
Posts: 10,849
Well I would partially disagree with this as I have had a few long Canon Lenses and one can use it quite well for astro work.

The 500mm F/4.0 would auto focus on any star, i would than turn it to manual focus and leave it there, it would be crisp and clear, and equivalent to the FSQ-106 which was also on the set up.

As the night went on, and the temp went down all that was needed was to auto focus again and turn back to manual and so on.

I took some awesome images i might add.

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