New Olympus 17mm 1.8

Started Mar 7, 2014 | Discussions thread
texinwien Veteran Member • Posts: 3,326
Re: New Olympus 17mm 1.8

tt321 wrote:

texinwien wrote:

tt321 wrote:

texinwien wrote:

tt321 wrote:

texinwien wrote:

In my experience, the condition in which the 20mm f/1.7 is slower to autofocus (that of switching back and forth between focusing on something between 0.2 and 0.5 meters and something between 0.75 meters and infinity) is an absolute rarity.

Not so fast.

Whoah, Nelly!

Please take a moment to read the portion of the quote I bolded above. Then take a moment to read the next one. It directly followed the above passage in my post, but you snipped it out in your reply to me:

I accept that this may not be the case for others, however.

Also this one, with which I signed off:

Or just about 99.9% of all photographic situations in which I find myself. Again, YMMV.

I believe I made it crystal clear that I was talking specifically about my experience, and that other photographers may have different needs. Do you disagree?

I sometimes have this work flow: See something, turn on the camera, (roughly) frame, focus, and take one shot or a number of bracketed shots. Turn off the camera.

My E-M5 is set to reset focus to infinity when I turn it on. It's usually finished with that before I am able to get the camera to my eye and frame my shot. In over 5,000 photos taken with my E-M5 and 20mm (one of 9 native m43 lenses I own), I cannot recall one instance in which I missed a shot because of slow focus with the 20mm immediately after turning my E-M5 on.

Again, that's my experience. YMMV (look it up if you don't know the meaning).

You seem to think that I was accusing you of generalizing your personal experiences to others, which I feel the need now to assure you was not my intention at all. For any confusion created, my apologies.

Starting out a reply with 'not so fast' implies that you disagree with and are about to correct whatever the person you're responding to has said. I'm not aware of any other commonly-accepted interpretation of that popular phrase.

Thanks for clarifying your meaning.

What I did was to supply another set of personal experiences, basically joining you in the task of filling out the entire set of personal experiences.

Not all cameras seem to have the facility of resetting lens focus to infinity? I must admit I have not seen or investigated this possibility with my G3.

I had a quick look at the G3 manual online, but didn't find any references to infinity focus. I'm not sure whether the G3 is able to reset the lens to infinity focus when the camera powers on, or not.

Your comments did spur me to do some quick and dirty tests, comparing the time to first photo after powering on with my 20mm and my 12-40mm. The 20mm does strike me as slower than the 12-40mm, but the difference appears to be (rough estimation) less than 500ms. Not a world of difference, but it could sometimes be important in the use-case you described.

Can you do another test since you have it with you. I found that all my four m43 native lenses cause the camera to sound differently (none of them is the same as any other!) in what seems to be the 'shutter sound', which I think might include the final aperture actuation sound - the sound produced between focus acquisition and exposure taken. Some would be more crisp and sharper than others etc.

I think you're hearing the aperture actuation sound. I have noticed that the aperture adjustments on some lenses are much louder than on others. See also discussions about rattlesnaking - most lenses will do it, but some are noisier (and therefore more annoying) than others.

Does this also happen with your E-M5?

Yeah - I just double-checked, comparing my 12-40mm to my 20mm. The 20mm is louder, and, visibly, appears that it may be doing more jumping around before the shutter actuates, although I'm not certain on that point.

Also the 20mm seems to have the longest delay between pressing the shutter button after focus acquisition and the blackout indicating picture taken. In other words, after the focus has been achieved, committing to shoot by pressing the shutter button all the way produces different delays. Zooms seem to be faster than primes and the 20mm seems the slowest. This is impression only without any hard measurement data so I am not trusting it. Still, bit annoying.

I've had a similar impression of the 20mm w/r/t aperture-adjustment speed. Like you, I haven't taken the time to test it rigorously. It would be interesting to put the lens through a variety of paces to see whether there were other performance bottlenecks unrelated to AF speed.

 texinwien's gear list:texinwien's gear list
Panasonic Lumix DMC-GM5 Olympus E-M5 II Olympus 12-40mm F2.8 OnePlus One Canon EOS 300D +20 more
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