On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,466
Re: Quite a lot of problem parameters...

The_Suede wrote:

Falk's studies are here, and there's others out there too. He's done some more on the same site too, with other cameras. I also have some accelerometer studies on the older D700 that basically say just the same thing, regarding the time spread of the vibration.

Yes, I am well aware of Falk Lumo's shutter-shock studies since a long time and have done a fair amount of testing in this area myself with my MFT gear, just not quite as ambitious. As you might already be aware, there has been very intense discussion about this matter in the MFT forum during the past year. What I was wondering about was specifically data supporting your contention that modern camera (as opposed to older) have very little mirror-slap impact but more so from the shutter.

Of course, the speed of the shutter-blade movement (and thus its impact) has increased historically from the 1/125 s sync speed offered by the first vertical metal-blade shutters of the 1960s but is currently not as high as when it peaked about year 2000.

Someone in our astro-group did formal tests with long lenses collar mounted, on starscapes (actually distant point-source lights, not really "stars"...) :), I'll see if I find them, and get back to you.


That was just for two cameras though, but I've found the general theory sound in practice too. Placing a hand on the camera when shooting with long lenses mounted to the collar gives sharper images in the 1/30-1/200s range than using timer release or remote release, something I've found that others that I trust to be reasonably methodical about their photography to concur on.

Yes, I understand the idea. A long FL obviously increases the risk of blur due to any displacement of the camera. And having the support directly under the point where the shutter is should be preferable (from a shutter-shock point of view, not necessarily others) to having it somewhere else, since it decreases the likelihood that shutter action forms part of a moment arm. Such an arm increases the likelihood of blur for reasons outlined here:


 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow