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!

Sergey Borachev wrote:

Anders W wrote:

Sergey Borachev wrote:

MAubrey wrote:

Well...you were only misled because you listened to the wrong people.

Sorry it turned out that way.

Unfortunately, it is not easy to tell the right from the wrong people, without spending a lot of time here researching and verifying comments. Number of posts, expensive equipment, or even quality of photos posted, are not reliable indicators of reliable comments. For example, even DPReview's review of this lens did not warn about this AF problem.

What problem? You mean this one?


As to DPR, they actually said the following:

"Autofocus is driven by a micro motor in the lens body, which works very well. It's not as fast as the Panasonic 14-45mm or 14-140mm zooms, but it's not terribly slow either (obviously this depends to some extent on the specific body used, with the E-P1 feeling just a little bit slower than the G1 or GF1). The focus motor is very quiet, and unlikely to intrude on any occasion. The 20mm F1.7 is also capable of continuous autofocus in movie mode."



Lenstip OTOH only said this::

"The autofocus accuracy is absolutely beyond reproach for a change. In lab conditions with good lighting the autofocus didn’t miss one single time."

Actually, Lenstip also said the following:

"In cameras used in the test, so in the Olympus E-PL1 and the Panasonic G2 the autofocus work is based on the contrast detection method. As a result the focusing is not a fast process. The lens-plus-camera system first goes to the area close to the right position, passes it and then goes back and only afterwards the focus is set. The whole process can take as long as over one second. What’s more, you can hear a silent whirr during the work. "



You are correct Anders, as usual, something was said but nothing like a warning, a Con in the Conclusion or something that could be more easily picked up as a no-go for those who cannot read in between the lines to realise there is a problem.

What they should have said is summarized here:


But that requires that you take the trouble to find out how the lens actually behaves under different conditions and are willing to think a bit outside the box, away from the simple, one-dimensional idea of slow versus fast AF.

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