I have put together a mount to prevent movement of heavy lens during
long exposures using the Olympus macro rail, two focusing stages and
telescope 3 point guide rings. The rings have three nylon tipped screws
arranged radially, this allows adjustment for various diameter lenses.
By attaching one to each focusing stage the separation can be adjusted.
Also the camera can be mounted to one of the stages if the lens does not
have two flat, nonmoving surfaces (typically shorter lenses). However
this requires adjusting the height of the camera or ring so the center
on the lens mount is the same height as the center of the rings. The
macro rail has enough movement to balance even longer lenses.
I've been using this setup for astrophotography, but now I will start
using it for macro work also. For astrophotography two 'feet' are used
on the macro rail to prevent rotation.
Possible sources for the rings are:
http://users.kricket.net/ken/
Or the ones I'm using:
http://www.losmandy.com/
Mon, 17 Dec 2001 John A. Lind wrote
> I realized there were limits to how much could be stacked when I put the
> entire Vivitar AT-21 on the back of the 200/4 once (12+20+36 = 68mm). It
> was stable enough, but near the limit. They Vivitar set is well made; the
> flanges are a tad less solid than the OM tubes though. Had been tempted to
> bolt the 300/4.5 on a tube or two, but after doing that with the 200/4
> realized it would take at least the entire Vivitar stack and be much less
> stable. Your comments confirm it wouldn't work very well without
> additional lens support.
>
> Thanks,
> - -- John
>
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