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Old 09-10-2008, 12:06 PM
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Robert_T is offline
Join Date: Oct 2005
Location: Australia
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Originally Posted by Octane View Post

Don't bother with astrophotography shots using the Canon EF 70-300mm F/4-F/5.6 IS USM lens. It has terrible, terrible chromatic aberration.

I have both the IS and non-IS version. Both are terrible with stars.

Humayaun, I wouldn't recommend this lens for astro either - too slow - but I disagree re CA. I have found this lens excellent with negligible CA, far less than many primes. Check out the photozone review of the lens, link below and quoted - "The lens produced a varying but quite low degree of chromatic aberrations (color shadows at harsh contrast transitions) at the image borders. The average CA pixel width remains well below 1 pixel at all focal length so it's usually nothing to worry about." Note that at FL below 200mm the CA is extremely low.
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