E-P5 and "shtter Shock"

Started 9 months ago | Discussions thread
3DrJ
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Re: "sh_tter Shock": multiple cases and causes?
In reply to Anders W, 9 months ago

Anders W wrote:

3DrJ wrote:

Great term! Especially the "fill-in-the-blank" missing vowel between 'h' and 't'.

Putting a 'u' in there, and reading the numerous posts about it, quite a few hypotheses have been put forward that might account for unexpectedly blurry images. So it seems not a settled issue.

Whenever there's multiple "explanations" for something, leads me to wonder if there's more than one thing going on. Perhaps the "cause" of blur is different in various cases. Disentangling which is which may not be so easy.

So it's conceivable the problem could be "shutter button jab", shutter vibration, IS or AF mechanism "looseness", other factors not yet teased out, or >=2 of these at the same time.

As a side note, it's good to see this being investigated rather calmly and patiently, without "hysterics" that sometimes have been evident with other issues.

I've had instances of mysterious blur with the E-M5, but I've just started to review the situations re: lens, shutter speeds, etc., and consistent patterns not yet emerged. However, I'm going to keep looking at it, and maybe will have more to report later.

If you search for "shutter shock" on this forum (which you potentially might do even more effectively via google than the internal search function), you will encounter a large number of prior threads on the subject as well as quite a few tests. Many of the comments in the threads on the subject that have surfaced during the past few days are poorly informed because the posters aren't informed about what has been said and done in the past. In reality, I think we have a pretty good understanding of what's going on and not.

Can't say how informed posters have been, but to me it's pretty clear subtly blurred images can occur via an array of factors. Shutter-induced blur is not necessarily easy to distinguish from camera or subject motion blur.

Here's an example: I had a series of shots at different shutter speeds, holding the camera at a distance, using the monitor for framing. Of course, this is likely to give inconsistent results (vs. camera on a tripod), but illustrates what one might encounter in "real-world" camera use.

This scene was the test subject:

Test photo 1. Test photo 2 looks the same at normal magnification.

Two test photos, only showing first. Second photo looks essentially the same at normal viewing magnification. However looking at the image at 250% reveals a difference:

Detail at 2.5x from test photo 1 (1/60 sec). Shutter shock?

Detail from 2nd test photo (1/60 sec). No blur evident.

These photos were both taken in quick succession (at 1/60 sec shutter speed setting) with the E-M5 and 45mm. On close inspection the first appears to have the vertical "double" blurring of shutter shock, but the second doesn't. IMO, the first is just common camera movement blur. I think camera users may see such results in images and wonder if it's shutter shock or not.  Maybe there's no simple or single answer.

Here's an example of fairly recent thread (two months ago) which contributes some new tests as well as links to previous ones:

http://www.dpreview.com/forums/post/51907504

Thanks for the reference.  However I've seen the topic and read a good number of threads over the last 3-4 years or so.  The fact that the topic emerges fairly regularly, and new tests are invented, seems to suggest variability of the shutter shake phenomenon.  Naturally, interest in it arises with new camera models as each introduction potentially brings with it twists in how the problem presents and where it stems from.

In recent threads it was discussed how DPR seemed to obfuscate the issue in the EP5, stating differences when using touch screen vs. shutter button.  In other words, if we believe DPR's idea, the source of "shake" that affects images is broader than just the mechanical action of the shutter, thus confusion among camera owners as well as testers.

Jules.

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