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Old 27-12-2011, 01:14 AM
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OICURMT
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Join Date: Apr 2010
Location: Laramie, WY - United States of America
Posts: 1,555
Quote:
Originally Posted by mldee View Post
Finally, As a "pusher", rather than a full focus lock, in order to keep the mirror moving against the focus screw, I was thinking of adding a thick donut of soft foam to the rear of the mirror, so that it gradually compressed as the mirror moved rearwards in focus, thereby "pushing" against the "pull" of the focus rod. Simple and may work. Comments?
Man, that's one out of the box solution.

Seems logical to me,
  1. light weight so no balance issues
  2. resistance would increase as you compress it, so you could select the appropriate stiffness as you approach focus
  3. ease of implementation


Possible problems...
  1. depending on the type of foam, gas can be emitted (chloroform if I recall correctly or formaldehyde)
  2. compaction may not be uniform (would this really be a problem? you're just trying to stop the mirror from moving under its own weight)

OIC!
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