New Olympus 17mm 1.8

Started Mar 7, 2014 | Discussions thread
Jeff Tokayer Veteran Member • Posts: 6,278
Re: 17mm f1.8 is DEFINITELY faster than 20mm f1.7 as regards AF

Anders W wrote:

Jeff Tokayer wrote:

Anders W wrote:

I have tested the AF speed of the 20/1.7 against that of the 12/2, the 45/1.8, and the 14-45/3.5-5.6 under strictly controlled conditions on my E-M5. Result: The speed is for all practical purposes the same. See here for details.

Have you performed any similarly well-controlled test?

The best test are real world test.

Only if they are tests. What most people call tests aren't. They are just subjective impressions, and such impressions are not infrequently wrong.

When I walk around with my camera, I'm not doing a test, I'm trying to capture fleeting moments.

The 20 is a slow focusing lens.

Not in ordinary AF-S use.

That's the key word, ordinary. I don't ask my subjects to pose.

The 12/2 and 45/1.8 are substantially faster, when it comes to grab shots.

What exactly is a "grab shot" and in what way does AF for grab shot technically differ from that of other shots?

As above, you barely get a chance to frame and shoot. The beauty of street photography.

The 17/1.8 crushes the 20/1.7 in AF speed.

Clearly not. The 17/1.8 is about as fast as the 12/2 and the 45/1.8 and they do not crush the 20/1.7 as you can see here:

As I said, real world test means going out and shooting. No props, no special lighting, no stop-watch. I do own all 3 lenses, and the 17 responds quicker than the other 2. If it only was as pocketable as the GR...

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