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16-35mm f/2.8L II possible lens blur problem

Started Aug 19, 2015 | Discussions thread
MitchAlsup Veteran Member • Posts: 5,518
Re: 16-35mm f/2.8L II possible lens blur problem
1

While I agree with the person above who stated that one (or more) lensing elements are out of (what astronomers call) collimation;

There might not be a lot Canon can do for you.

The other thing is that I never use a lens wide open for astro images, try stopping it down to F/4 and F/5.6 or F/8 and see if the images clean up. Also note at 24mm, a 30 second exposure will have stars on the equator move 6 pixels or so unless you use a motorized mount.

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Mitch

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