100mm f2.8 L IS IQ for general work?

Started Dec 10, 2011 | Discussions thread
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Phil1 OP
Contributing MemberPosts: 972
Re: 100mm f2.8 L IS IQ for general work?
In reply to Phil1, Dec 15, 2011

My great thanks for all of your very helpful replies!

I originally asked as some of my photos with the 100mm f2 were a little soft. However It looks as if my 100mm f2 may be back focussing by ca.1 cm which would make close-ups @say 1m & f2 problematic as the DoF is only ca. 1cm. However, I’m going to look into this more thoroughly. (My 5d doesn’t have a micro-focus option – a reason to get the 5dii I ask myself?

I was aware that the ‘focus-lock & recompose’ method can give errors but I had no idea that they could be so great e.g. see:


I’ll do some tests to see how it pans out in practice (as the calculations assume flat planes of focus but in practice they may be slightly curved & so would be lens dependent).

Thanks again!


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