I feel misled: Panasonic 20mm f1.7 II AF is SO SLOW!

Started 3 months ago | Discussions thread
Anders W
Forum ProPosts: 17,052Gear list
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Re: I believe it.
In reply to Klarno, 3 months ago

Klarno wrote:

It's one of three AF lenses in the system that uses unit focus instead of internal focus. They focus by racking the entire optical system back and forth. The others are the original 14-42 that was the kit lens for the E-P1 and the E-PL1, and the Olympus 17mm f/2.8. They didn't actually change the optical formula or mechanics for the 20mm f/1.7 II, they just changed the coatings and gave it metal pants.

Internal focus lenses are faster because they are able to use lighter mass groups for focus.

Sure. But the speed of the lens AF mechanism is the bottleneck only sometimes. See here

http://www.dpreview.com/forums/post/53579948

and here

http://www.dpreview.com/forums/post/50877416

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