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

Started Apr 28, 2014 | Discussions thread
Klarno Veteran Member • Posts: 4,141
I believe it.

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.

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