On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
Anders W
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Re: let's see a flipping mirror full frame tripod photo
In reply to RussellInCincinnati, Dec 23, 2013

RussellInCincinnati wrote:

Chris Malcolm wrote:Of course the much bigger and more violent shutter and mirror machinery of full frame DSLRs is a more serious problem. I'm surprised more people haven't remarked on that as a reason to prefer APS-C.

Anders W wrote: I understand what you mean. Nevertheless, it doesn't seem to work that way in practice.

This sounds like you are referring to your own practice, hence you would have plenty of examples available.

Anders W: While I am certainly not saying that FF DSLRs or DSLRs in general are free from the problem, it appears, if anything, to be worse with small and light mirrorless cameras

Then it will be falling off a log for you to show us the full frame flipping-mirror DSLR photo, that you took, say one that was taken on a portable tripod, a real photo not some test setup, with or without a remote shutter release or self-timer, of normal to portrait angle of view, that represents the lesser vibration problem of that type of larger flipping-mirror rig that you describe.

Make sure it's a long exposure, say 1 second like the one below, let's not muddy the waters by you posting an electronic flash photo at 1/8000th of a second or whatever.

Feel free to show us something from a much finer lens and aperture setting than the $50 dollar e.bay Alpha mount plastic kit zoom at F/13 used for this small-cam mirrorless APS-C example. Be nice if your example was from a sensor with an anti-aliasing filter, to further level the playing field.

With regard to long exposures on a tripod, I thought it was common practice among SLR users to use mirror lock-up. At least that's what I did with my SLRs. So I fail to see that blur due to mirror-flap should be much of a practical problem in this particular context. Nor is shutter shock any problem at these shutter speeds. The problem is known to peak at shutter speeds of approximately 1/100 s and disappear more or less gradually as you go faster or slower than that.

Aside from that, I consider visual illustrations like those you show pretty uninteresting as pieces of evidence with regard to the general (and statistical) question at issue here: whether blur due to shutter shock is more prominent with certain camera types than with others.

What you might want to do is utilize the search function here on DPR or on Google and search for "shutter shock" and have a look at the what you come across that way. Not saying that this is in any way conclusive evidence with regard to the objective situation. But I am sure it shows quite convincingly that "shutter shock" is currently perceived to be a far greater problem in MFT circles than in FF DSLR circles.

You might also find this post in the present thread and the subthread it spawns of interest:

http://www.dpreview.com/forums/post/52630115

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