----- Original Message ----- 
From: "Lon Williamson"
Subject: Re: Max weight of tele lens on *ist D


> Well, what about vertical shots, where the camera
> has to be flopped, vs the lens mount rotated?  I would
> assume vertical shots are trickier to keep sharp on
> long lenses w/out tripod mounts.

If the camera/lens combo is mounted with the rotational axis (thats
where the camera meets the tripod) close to the same plane as the
moving parts (shutter/ mirror), then there is no distance advantage
for any vibration to operate on the camera system.
Move the rotational axis away from that plane (like to a lens mount)
and suddenly the rotation that the moving parts are trying to impart
has some space to work with, and whammo!, more vibration problems.
The only tripods I have found really good for taming vibration are
made of wood.

William Robb


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