AF speed test Lumix G 20mm f/1.7 old and new lens on Lumix GX7

More info: http://m43photo.blogspot.com/2015/08/...

The Lumix G 20mm f/1.7 pancake is a classic Micro Four Thirds lens. Being the first Panasonic prime lens, it is widely considered to be very well performing. But it has some shortcomings: Due to the old fashioned focus design, where the whole lens assembly moves back and forth during focusing, the autofocus is rather slow. Also, the large focus assembly makes it very noisy when focusing.

In 2013, Panasonic updated the lens. It is well known that the new lens is largely a cosmetic redesign: The optical layout is the same, and the focus method is the same. But is the new lens better?

The noise and autofocus speed is the achilles heel of the Lumix G 20mm f/1.7. To see if the new lens focuses faster, I have mounted both to the same camera, the Lumix GX7.

Even if the lenses behave slightly differently in this test, I think that neither is consistently better or worse. My conclusion is that they perform equally good, further suggesting that they do indeed have the same focus technology.