If you bond the mirror to its cell, you don't need edge supports or mirror clips. In previous studies, I found that a 10" mirror can benefit from a ...
All this nonpigmented and mirror lab and industrial supplier and aquarium talk is very good, but a tube plain old GE-II silicone bath tub sealer from Home...
Why not a Clementine double joint in the middle of the OTA? That way you just mount the eyepiece at a location that does not have anything protruding into...
Actually, some Hindle-believing fundamentalists who dare not question authority will use a silicone pad support in a conventional Hindle mirror cell. To do...
... Note that the parallel-motion knife-edge mechanism does not keep an eyepiece/camera centered...just parallel. This works for very small amounts of...
Thank you for your advice. If I may ask, why is four points more important for a longer fl (shallower curve) that for a shorter? Brian ... or mirror ... ...
Bear in mind the supports from what I've heard and played with in PLOP need to be pretty close. And are actually only at about 39% of the radius for my 6", not...
So, you believe in PLOP, and not in HIndle? I believe that my ten-year campaign to reform the common practice has come to a successful conclusion! I...
In a longer focal lenght telescope you are working at higher powers and desire a diffraction-limited image. For shorter focal length telescopes, comatic...
... I believe becuase the steeper curve of a fast mirror means a thinner center which may seem negligable but from what I've read needs to be taken into...
Sure, I'll give you all I got. If I give you 13.2, you will not have to worry about TDE-- you can paint out the outer 0.1 inch. However, if you are to work...
We've all had the perfect pitch lap before, and I did to untill last night. I had just completed polishing and was going to start figuring the next night. For...
In storing a pitch lap, NOTHING must touch the pitch. The best storage container is a plastic cake container. Even the slightest touch, over a long period...
Hi Mitch, ... They sure don't *need* to! Particularly if you plan to RTV the mirror, it may be much more robust to place them nearer the edge - PLOP will show ...
... have to ... you ... procedures. ... thermal ... Oh yes, your cellular (slummped?) blanks of 1/4" plate. Perhaps to avoid complicating a seocnd project too...
A friend of mine in my astronomy club is an ophthalmologist so I told him about this discussion. Here's what he had to say: Greg - The question is, why does a...
Just how necessary is it to support mirrors as indicated by PLOP et al. ? I polish/figure my mirror on carpet and then test it whilst it is on edge and...
When you worked on the carpet hopefully you rotated the mirror, tool, you, perhaps the carpet. Randomizing acts all to keep from putting astigmatism and other...
... Plop gives 2.2 nm RMS with the supports at 40% on a 10 inch 1:6 mirror of moderate focal ratio. Really measure your mirror thickness though. When I was...
... Yes, a lot of ATM experience indicates a good grade,of hardware store silicone will usually work out. Do use fresh stuff. It does go bad slowly sitting...
... I've got a whole web site on this http://www.atmsite.org/contrib/Holm/Plop_optimized_cells/index.html Problem is: I am a wordy SOB, so you may want the...
... I should have added: see my S&T article Mirror-Cell Design with Plop Mark Holm; Sky & Telescope; Mar 2005; page 119 Find it at your public library or buy...
... a ... Fortunately: thinner mirror means less torque. Mark: to calculate the torque take the (small) angle between the line Mirror CoG - support and the...
I will check in my garage for solid pyrex from Arizona Kelly. But you will have to pay for it; I told him I would sell it for him. That was a long time ago,...
You should bug your opthalmologist buddy for a jug of atropine sulfate eye drops. These will open up your pupil farther than would be naturally possible even...
I used to have a Nastran model showing in-plane deformation from two pegs. You are much better off with the weight carries by a piece of duct tape stuck to the...
