... A small point, James. We here in the USA (including MS and Intel) assume that an increasing angle is in the CCW direction, and that an angle of zero occurs...
Tom Stokes
tstokes@...
Mar 1, 2004 6:39 pm
3526
Um..good evening gentle people, I think (gender correct), ??? I am a true ATM. and make no bones about it..And this is my second mirror which means I know just...
I have a lamp illuminating a grating at on side of the ROC, the mirror positioned at the opposite side reflecting light back through a grating located next to...
... If you do use 2 ronchi grids like this you MUST make sure that they are lined up properly or you will not get good results. Most often the Ronchi test is...
Hi! Ive heard some rumours that one can make a good end leight tube out of an ordinary carboard tube and then apply some layers of epoxy. Does anyone have any...
Well just wrap some layers of fiberglass with your epoxy and you will have a nice tube. I make tubes using West Systems marine epoxy and plain old fiberglass....
For those interested , and if it hasn't been allready been mentioned , the telescope featured on the homepage of ATM free, is a 16" F4.5 Newtonian built by Joe...
Peter, You can search for phenolic tubes on your favorite search engine. These tubes are the staple tube used in model rockets and are widely available in...
Astigmatism assessment-is there a way to compare the amount of astigmatism present by comparing test results produced by FigureXP from 2 axis. I've tested on 2...
Hi all... Im trying to do the Foucault test. Fixed source, slitted. I have not yet put the mask to the mirror in an attempt to get aligned. Looking past the...
... no "greying" ... You are either to far inside or outside the ROC. The shading happens when close to ROC. To get closer to the ROC get the reflected image...
Hi John, The results described below strongly suggest that your mirror has significant asymmetry. However, from a normal Foucault test you can't determine how...
Hello, Ive repositioned the tester... I guess I was inside ROC. Now, as I cut the knife across (from the left) I see a semicircle of black (its str. edge smack...
Hi Is there (must be) a correct slit size (width)? Im trying to test a 10in f6...(Foucault test, fixed source) Thanks, Tom K. (parallel in Temecula,...
Hi Tom It sounds like you are now outside of the center of the mirror curve. The knife "shadow" cuts in from the knife side inside ROC and from the opposite...
spheroidal mirror you will find a point when the entire mirror blinks out all at once with no shadow running across. Yikes, everyone keeps refering to...
Not wanting to burst the bubble. ;-) I too thought I was going to go straight to a parabolic shape with my one and only mirror so far. As I was getting...
... Hi Tom, Your "gray" might be more "Black/White" depending on the focal ratio of your optics. Those short focus mirrors don't show a lot of graying, they...
... Thanks for replying Dave, I'm going to make the mask as you suggest before I start action on the glass. I would like to learn from this so I can figure out...
... (hopefully) a ... Tom, It is a bit early to hope for a mimiracleuch as a paraboloid at this stage. I personally have never heard of that happening. The...
... Don't know how the text got all screwed up in my message. Oh well! You might consider posting pictures of your setup as well as the reflected image. Keep...
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