Re: [APML] Guidescope questions

[Chris1011@aol.com]

In a message dated 10/16/2002 10:34:07 AM Central Daylight Time, tonyhallas@foothill.net writes:


> unless you can bolt the mirror down securely, something always moves and you get differential flexure


The mirror is not the only thing that moves. The entire structure of mirror, cell, tube, mounting parts, etc. will move relative to each other. Just the weight of the camera on the back of the telescope will move the optical path a small amount because of flexure in the camera couplings as well as bending of the rear tube casting. The other question I would have is whether or not the curved field of a Schmidt-Cass would give you reasonable focus across the 6x7 negative. I doubt that it would cover even half of the format, nevermind the huge vignetting you will get.

Roland Christen