... this discussion ... serves as a reminder how much
"micro-instability" there probably is in most tripod set-ups, and how challenging it is to get a *truly* rock-solid support for the camera, which is more and more important the longer your lens is, (especially for those who can't afford IS on 400+mm lenses!).
Ken
Amen Ken - this is what makes IS which works on tripod mounted lenses so valuable i.e., necessary. I recall threads, of several years ago, about about images that "jumped" or "swam" especially if tripod mounted. This plague disappeared with the version of IS Canon placed in the "big white lenses."
As a user of a 600 f/4 IS I'm amazed How slow a shutter speed may be used (often encountered when using a 2x converter, so that the lens becomes an f/8).
Now, the remaining issue is- even though you get solid lock down and have IS - how about vibration induced by mirror slap? The pundits go both ways on this (Fritz Polking is one of them). I could be wrong, but I believe mirror "lock up" at shutter speeds between 1/60 and 1/15 of a second finishes slightly, but very slightly better than IS. I've been using IS only at those speeds and had no complaints regarding image shake.
Regards,
Plumviewer
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