E-P5 and "shtter Shock"

Started Oct 6, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: E-P5 and "shtter Shock"

Simon Cowell wrote:

Anders W wrote:

Simon Cowell wrote:

Certainly these are all interesting ideas, but how do we know that it is indeed possible to conduct tests for shutter shock with normal photographic apparatus?

I mean, we know that IBIS is designed to counteract human shake (which must be of low frequency) but shutter shock may be due to vibrations in specific (higher) frequency range produced by the shutter at speeds 1/80 to 1/200. Exact tests to find the root cause may only be feasible with specialized equipment in a company (Olympus?) laboratory

Why wouldn't it be possible to test the things I reported on in my previous post? I have tested them so I know it is possible with normal photographic apparatus. You choose a suitable target (one which easily reveals the slightest blur), shoot a fairly large number of images at each setting (since the problem is probabilistic and varies on a shot-to-shot basis), vary the settings (with regard to for example IBIS on and IBIS off), and check the average outcome with regard to sharpness.

That's right, you can conduct such a test, I agree, and don't get me wrong, I'm not trying to be negative, I really appreciate your (and others') efforts.

What I meant was that with such a test you can observe the evidence of the effect (as DPR have done) but will it offer a good explanation as to what the root cause is?

It seems to me that the two main variables here, shutter and IBIS, need to be disengaged from each other and this is because IBIS is probably still working even if it's turned off (if I recall correctly the "theory" is that the sensor is floating in an electromagnetic field and is not rigidly mounted in the body even with IBIS off). This can only be done by Olympus I think.

Yes IBIS is still working even when it is turned off in the sense that electromagnetic force is needed to hold the sensor in place. What is therefore impossible to test (unless you have special resources at your disposal) is how well the camera would do with regard to shutter shock if it had a mechanically fixed sensor and no IBIS.

What we can still test is whether the IBIS control system is somehow fooled by the shock. As far as the new (E-M5 and later) IBIS is concerned, my answer to this question is negative. In the main, I find little difference, when it comes to shutter-shock resistance, between IBIS on and IBIS off. If there is such a difference, it is marginal.

So if this IBIS version would somehow cause problems from a shutter-shock perspective, it would be because the electromagnets are too weak to hold the sensor in place with sufficient rigor. I personally deem that unlikely but I can't say I know for sure. However, one indication that this cannot be a major problem is that enabling the OIS of my 14-45 (and turning IBIS off) gives significantly less blur due to shutter shock than I get with IBIS on (and OIS off) or with both stabilization systems off. If the inabiliity of IBIS to simply hold the sensor in place with sufficient rigor would be a major factor, the OIS of the 14-45 wouldn't be able to help much.

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