"Sharpest" shutter speed when using a tripod?

Started Dec 26, 2011 | Discussions thread
Carlos U
Regular MemberPosts: 289Gear list
Re: "Sharpest" shutter speed when using a tripod?
In reply to pentaxfun, Dec 26, 2011

I remember an article in Modern Photography way back in the eighties, where the author attached a spotting scope to a top of the line SLR (Canon F1, if I remember right). The field of view was equivalent to a 3000mm plus telephoto. He took various test shots at different settings. All were done from a tripod, of course, with and without mirror luck-up, at fast and slow shutter speeds.

The ultra high magnification made evident even the slightest presence of shake or vibration. The shots were sharper when MLU was used, but even then, there was a hint of blurriness produced by the shutter itself. The sharpest shots where done using a slow shutter speed of various seconds, putting a black cardboard in front of the lens and removing the cardboard some seconds after releasing the shutter. The correct exposure was a matter of trial and error.

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