Cameras with f2.8 focus precision

Started Jan 24, 2013 | Discussions thread
Scott Larson Veteran Member • Posts: 5,950
Re: I like Mike's answer

Schwany wrote:

Scott Larson wrote:

I've owned both lenses. The AF motor in the f2.8 is strong! I can feel it focusing whenever I handhold it. The f4 version is more like the older f2.8 motor.

I've got the IS versions of both. Was the f/2.8 non-IS version slower than the IS version and not that much faster than the f/4?

Are we talking about 300mm lenses? I've only owned IS versions of both lenses.

Where the f/4's fall down is with a Canon 1.4x extender.

My copy of the 300mm f4 was a little soft wide open. Believe it or not, it was great at f4.5. I used it with a teleconverter in bright sunlight (stopped down) and it worked decently. Unfortunately bright sunlight is not something you can count on where I live.

 Scott Larson's gear list:Scott Larson's gear list
Canon EOS-1D Mark III Canon EOS 5D Canon EOS 5D Mark II Canon EOS-1D Mark IV Canon EOS-1D X +13 more
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