Firmware upgrade causes AF slow down on 18-55!

Started May 23, 2013 | Discussions thread
baobob
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Re: Just updatedw/ 18-55
In reply to Travelshooter, May 24, 2013

I guess that diffrences of behavior are due to differences in background contrast

I use dim part of my corridor with a very dull grey wall paper with very low contrast

It's a kind of torture test but it reveals differences between lenses best to worst : 18 35 90 18-55 at 55

In such conditions the 5D2 EOS locks without problem, not so fast as well with the 24-70mm 2.8

The problem at 55mm is the small 4 aperture that does reduce the light for contrast detect to work well

But this torture test is not a kind of pure academic one : very similar bto what you can find in bars and pubs, clubs, at night.

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