Und da ab und zu Diskussionen aufkommen, heute bräuchte man keine Spiegelvorauslösung mehr, hier ein Verweis zu einem Artikel, in dem David Kilpatrick die DSLR-A550 ausführlich getestet hat:
http://www.photoclubalpha.com/2009/11/18/s...ghs-and-lows/4/
Er trifft darin die Aussage:
ZITATThe Mirror Lock omission
[...] I was unable to get a sharp picture with this rig because of the lack of mirror lock-up unless either flash or a very long exposure was used. Speeds like 1/13th, 1/25th, 1/50th consistently produced shake from the mirror vibration which ruined all such shots regardless of how firmly the tripod was locked up, and whether or not SS was enabled or disabled.
[...]
I made many hand-held tests around the critical speeds for mirror shock shake - times like 1/6th to 1/60th, with the worst effects normally arriving around 1/15th to 1/30th. I was unable to use a 100mm macro on my Gitzo tripod with Giottos ball and socket head at times round 1/20th-1/60th; the mirror slap was transmitted consistently and visible, resulting in a double image blur every time despite using the 2s self-timer option. Hand-held the combination worked far better but of course there was no self-timer, just a careful regular exposure.
The only way I could get sharp images without flash was to work in light low enough for exposures between 2 and 10 seconds. Here is an example, 3.2 seconds at f/10, ISO 200, with the 100 Minolta AF macro working between 1:1 and 1:2:
[...]
Practical results tell me the MLU omission is not a disaster for the average user who won’t use a tripod or try 1:1 macro using natural light - but it makes the camera almost useless for those who want to. This in turn spoils the value of the MF Check LV, which is valuable for macro work. Common sense tells me it would have been easy to include it, along with the AF/MF switching, as part of the MFC LV mode. But the same goes or all the models from the 200 onwards which have omitted the 2 second mirror-pre-lift function. This also limits photomicrography, telephotography, astrophotography and top quality natural light work of any kind.[/quote]
ZITATI’ll also make a point about some irrelevant comments appearing on dPreview about macro shots and mirror lockup. [...] I just happen to have tested macro; long tele, photomicrography or astrophotography have exactly the same problem. Anything where a shutter speed of around 1/30th (give or take a bit) is likely at the optimum working aperture in typical ambient light conditions. This has nothing whatsoever to do with macro field shots of insects taken hand-held, where MLU is irrelevant and optimum shutter speeds are in the region of 1/125 minimum to an ideal 1/500th-1/1000th, or with flash.
What I have found is that within the ‘danger zone’ of shutter speeds (well enough known to anyone who has had to photograph resolution test charts, which I did for a couple of decades) MLU makes a critical difference. In fact it’s almost impossible to conduct a lens test without it no matter how good you think your tripod is. For that reason many lens tests are shot using flash; it eliminates the camera vibration variable.
As commented in the report, for hand-held work SS does such a good job that I would have been better off shooting some macro tests at 1/30th hand-held with SS, rather than on a tripod without SS (and tripod+SS=disaster - that was clear).[/quote]
Viele Grüße,
Matthias