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next PZ lens test report: Sigma AF 120-300mm f/2.8 APO EX HSM DG OS
#19
[quote name='simon_k' timestamp='1308216711' post='9287']

I tested it in the shop and outside where it was quite bright (about 1/500 to 1/1000s at f/2.8 and ISO200).

I guess the size of the lens elements is just too much for the motor. The 70-200 has the same problem. It's not slow but compared to the fastest Canon lenses Sigma should be ashamed of their work.



What I forgot to mention was the OS - it takes a second or so to work but the it is amazingly good. I managed to get shots at 300mm and 1/30s. You have to pixel-peep to see a slight blur.

[/quote]



These lenses have a rear focusing system so the AF unit isn't all that heavy.

However, it is unfair to compare a zoom vs a prime lens here.

That said Ring-USM is still the place to be in Canon land if this is a priority.
  


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next PZ lens test report: Sigma AF 120-300mm f/2.8 APO EX HSM DG OS - by Klaus - 06-16-2011, 01:46 PM

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