Anders W
Forum Pro
No matter which is which, neither is sharp. And you need to shoot quite a few images before as well as after to see whether anything has changed. The problem is stochastic (probabilistic) so you need a big enough sample.
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Does version 1.5 affect the shutter shock any?
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Anders W
Forum Pro
I ran a quick test with a small sample using one of the lenses I know to be affected (the 100-300 at 100 mm). Shot a sample of about 10 shots before and 10 shots after the upgrade using the same target as the one I have employed when testing for the same problem in the past. Regrettably, there is no difference as far as I can tell.
Anders W
Forum Pro
I know you saw problems with your 25/1.4 as well as the 45/1.8. I don't have access to the 25/1.4 but I have never been able to confirm much of a problem with the 45/1.8. I do see problems already at an FL of 45 or thereabout, but only with lenses that are a bit heavier and with longer barrels such as the 14-45, the 40-150, and the 45-200. With the 14-45, fortunately, the problem is pretty much eliminated by using OIS rather than IBIS. Still not sure why some of us see the problem with the 45/1.8 and others don't. But it suggests that there is at least a chance that you were particularly unlucky with the two bodies you tried.
I also ran a quick test last night after 1.5 update. I had noticed the problem the most on my 12-50mm kit lens at the long end. So I recreated my test with small text target across the room (about 15 feet or so) and shot from 1/200 to 1/10 handheld with IS on and no anti shock. Whereas before I noticed significant degradation in sharpness from about 1/60-1/100 s and better resolution at faster and slower shutter speeds, after the update, they were all pin sharp! I was floored. Granted, the light wasn't great in the room last night and I was maxing out the ISO to 5000, but all the images looked pretty good in the affected shutter speeds. YMMV.
Is that with or without IS enabled during the half-press? As some have argued, disabling IS during the half-press (so that IS activates only during the exposure) might make things more effective.
Thanks for your tests.
Anders W
Forum Pro
You need to shoot at lower ISOs, in good light, and with a discriminating target in order to test reliably for the problem. I have no trouble getting *passably* sharp shots with the affected lenses in the critical range of shutter speeds. Sometimes I get very clear double contours and sometimes not. The problem is getting images that are *tack* sharp as opposed to *passably* sharp. See here for an example of the kind of target you need as well as for the magnitude of the differences we are talking about.
http://forums.dpreview.com/forums/post/42187475
Anders W
Forum Pro
In this case, I tested only with IBIS enabled during the half-press. I also tested with OIS (mode 1) rather than IBIS enabled. In earlier tests, which were quite extensive (I think I approached a thousand or so exposures), I did test with as well as without IBIS enabled on half-press without noticing any significant difference. This is in line with expectations since the kind of advantage you could potentially gain by having IBIS enabled only during the actual exposure (that the sensor starts out at the center and thus has more freedom to move in all directions when the exposure starts) is unlikely to affect its ability to cope with the shutter shock (where that latitude is not likely to be consequential).
I haven't tested whether keeping IBIS enabled or not with half-press affects effectiveness in respects other than the ability to counter the shutter shock. However, I have tested quite extensively with OIS whether mode 1 (OIS enabled prior to exposure) or mode 2 (OIS enabled only during the exposure) is more effective. In this case too, mode 2 should in theory be more effective for the same reason (more latitude for the OIS lens group to move in all directions during exposure). However, I haven't found any siginificant difference in practice. AFAIK, most others who have tried to test for a difference between OIS mode 1 and 2 have come to the same conclusion, including DPR.
kenw
Veteran Member
First thing I checked after upgrading. On my camera the 45/1.8 was an easy lens to get problems with shutter shock, still the same story. No improvement at all.
Regarding stabilisation activated "only at exposure" vs also at "pre view at half press":
It would only be natural they would not differ IF one holds the camera steady and, so to speak, wait for the image to "set" before firing the shutter off.
The possible advantage, as I tend to see it, of using stabilisation only at exposure would be if one "flickers around" a lot when for example using a long f-length lens, thus making it hard to hold really steady. The "margin" for the sensor to move around seems rather large, so, if one ensures to let it "home in" before firing the shot (easier with shorter f-lengths of course) I would think it wouldn´t degrade the performance if the IBIS one bit, as in it working worse than when one has set it on "only at exposure"-mode.
On the other hand, having a "soft image" as one get in the "stabilisation set at half press mode" is also a big advantage in itself when using long f-lenghts, but kind of another issue anyway ;-)
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There is a significant improvement after the update. No question about it. Even in a low light impromptu test I would notice a difference before. Now whether I can get them "tack sharp" versus just sharp is another question I'll try to answer later. Thanks, Anders.
Anders W
Forum Pro
Yes, that would be the theory. Still, I haven't been able to see any noticeable difference between OIS mode 1 and 2 even with my 100-300 at 300. As I said, I haven't yet tried to test for the corresponding difference with IBIS (on versus off with half-press). We'll see what I find when I try it, as I eventually will.
Nope, the GH2 still offers Mode 2. The G3 doesn't, and I have no idea about the G5. It will be interesting to see what the GH3 has.
Detail Man
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I should have been more specific in making that statement. Yes, the GH2 features "OIS Mode 2". Panasonic M43 and compacts that have been released since the release of the GH2 (to the best of my knowledge) do not.
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