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

Started Apr 28, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: I feel misled: Panasonic 20mm f1.7 II AF is SO SLOW!

jhinkey wrote:

Anders W wrote:

jhinkey wrote:

The OP has a G3 listed in his gear list - this is a quite "old" model at 3+ years - could the G3 focusing be contributing to the slowness of the 20/1.7?

While the G3 is perhaps not quite as fast as the most recent models, it is surely no slouch either. Middle-generation as far as MFT AF speed is concerned. Besides, to the extent that the G3 is slow with the 20, it is slow with other lenses too. Body processing time is what it is no matter what lens is used.

I've never used my 20/1.7 on my G5 or GH2 so I have no idea how much slower it could be. I was just suggesting that perhaps the AF speed of the 20/1.7 is slowed down enough on a not-so-current body (like a G3) that it passed the threshold of minimum nimbleness for the OP.

I see what you mean. But as Pekka Potka showed in a test that no longer seems to be available on line, regrettably, the increase/decrease in AF speed when you move from a body with slower AF to one with faster (he compared the E-P3 with an earlier Oly) is about the same no matter which lens we are talking about (including the 20/1.7 which was among the lenses in his test). He also showed that the 20 was about as fast as other lenses included in his comparison under the test conditions he chose (AF-S, switching between focus targets at one and five meters if I recall correctly, no hunting).

Generally with my 20/1.7 on my GX7 I have no real complaints - only when racking from near to far or back does it show it's lack of speed. Short hops between distances are usually quick enough not to be an issue. Tracking of a fast moving object is not something I've generally tried to do with my m43 gear.


I may swap it out for the new 15/1.7, but not because of AF speed . . . .

Personally, I am unlikely to swap. Possibly supplement, although I am far from sure I really need another prime between the 12/2 and the 20/1.7.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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