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Re: [OM] Macro Crash Course; long [was] auto extension tube orauto-tube

Subject: Re: [OM] Macro Crash Course; long [was] auto extension tube orauto-tube 65-116
From: Jim Couch <JamesBCouch@xxxxxxxxxxxxx>
Date: Mon, 17 Dec 2001 07:28:18 -0800
The 65-116 tube appears to be a good combo with the 300. I have played a little
bit and vibration is a problem. I want to make a plate to tie the two tripod
collars (and maybe the camera body as well)  together for more stability. I
think the system has some potential though.

Jim Couch

"John A. Lind" wrote:

> At 08:42 12/17/01, Foxy wrote:
> >I've used the 25mm tube with the 116 and a 300 f4.5. I was bored and wanted
> >to do long macros. Too much vibraion (as expected), but hey, it was fun.
> >
> >Foxy
>
> 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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--
Jim Couch
Tacoma, WA USA



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