Archived posting to the Leica Users Group, 1999/10/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Some do over-estimate mirror lock up need, but even Herbert Keppler at Popular Photography did an article 3 or 4 months ago that said, after additional testing, it was more important than SOME manufacturers admit today. - -----Original Message----- From: Godfrey DiGiorgi [mailto:ramarren@bayarea.net] Sent: Friday, October 01, 1999 12:38 PM To: leica-users@mejac.palo-alto.ca.us Subject: [Leica] Re: Another comparison ... > If one is an SLR and one a rangefinder I definitely lock up > the mirror on the SLR; there is a huge difference in not having > mirror vibration being another variable. I have seen this statement so many times and it's just so much total bullshit. The ONLY time that mirror slap on any modern, well-designed SLR is of any concern at all is at a very very few shutter speeds (usually in the 1/2-1/15 sec range) where the *possibility* of a resonant vibration could happen *with some lenses*. Usually very long lenses or when the camera is mounted for astrophotography or photomicroscopy use. The photo posted was a hand-held snap, most likely at some shutter speed like 1/60 second with a lens set to approximately 35mm focal length, mounted on a Nikon F5. There is simply no possibility at all that mirror slap induced vibration could be detected in any analysis of these photos. Godfrey