I was playing around with Zemax to see if I could find a easy way to remove coma and I did. By making the primary hyperbolic I was able to mantain a very good...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the spiderless group. File : /Coma free...
spiderless@yahoogroup...
Feb 8, 2009 5:34 pm
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If you use a hyperbolic primary and ED glass then you can make this coma-free Chief I just posted. It uses an f/6 hyperbolic primary but the correctors make...
hi ed thanks for the info / as you know i am polishing a 20 in f 8 for a chief it is cool testing at 320 inches / i also have a 12 f7 that someone could use...
Hi, Ed and Others. I'm new to the list, and just wanted to say how fabulous this new corrector is! Anyway, I see that people have applied it to two-mirror TCTs...
The work I am doing at PPPL has virtually wiped out discretionary time. My ATM projects have suffered as a result. However, I have ordered the requisite panels...
Art- What ever happened to the drawings you were going to produce for the forum? Or are you going ahead and building without them? Couple of other points: 1)...
Roger, I was hoping that the post to the ATM list that I made last weekend about Ed's Spiderless mailing list would attract some of the can do, will do people...
Hi, Randy. You're too kind to me, but thanks. Like you I just do this stuff for fun and fascination. The Ed-Corrector really does marvelous things, and Dick...
Hi, All. I added my file: 8in f/15 Schief plus Corrector, but I see now that this just reproduces work Ed already did. Sorry about that. Anyway, I'll leave...
Hi All, What I would really like to see is a couple of equations for calculating the corrector for those of use without Zemax. I use OSLO EDU. This way we can...
Hi Roger! Welcome to spiderless. Yes the correctors work on all three groups of TCT; schiefs, Yolos and Herschelians. I guess it would work with a lot of the...
Hi, Ed. Yes, that is a surprise. Probably no practical advantage in a 3-mirror for ATMs. Just of interest to raytracers. Cheers, Roger PS Sorry, Dave. I...
Hi, Ed. I looked at the Jolo. Very nice corrections! It is also possible to throw the second reflection on the other side of the mirror and use your doublet....
Are there any observers' reports of looking through a Chief? Wondering how well these work out in practice. You can write my off-list. Cheers and thanks, ...
Hi Roger, Yes the correctors do not do anything for spherical aberration or coma unlike the Maksutov-Herschelian or Dick Buchroeders CHT. They only fix the...
Actually let me amend this to say coma instead of astigmatism. When you tilt a plano CV or CX lens you get primarily coma and the same for a tilted primary. Ed...
Hi, Ed. I think you'll find that you get both coma and astigmatism, although coma (I believe) is dominant, at least for small tilts or off-axis positions. If...
I uploaded a file called R3 ttled OPD of tilted lenses showing the effect on the OPD of lenses in a converging beam. Scale is 1000 waves. #1 Shows 2 lenses in...
Hi, Ed. Thanks. Yes, the basic Yolo mirror tilts cancel coma, and the torroid was employed to cancel astigmatism. I think one can find this stated in Art...
Wes asked: Â Â "Art- What ever happened to the drawings you were going to produce for the forum? Or are you going ahead and building without them?" ...
hi ed when will the book be for sale ? will it cover mirror polishing ? ... From: Art Bianconi <artbianconi@...> Subject: [spiderless] Digest Number...
Hi Ed, Interesting discussion. We did indeed find the view through your Chief at Stellafane impressive. Matt and I both. We enjoyed meeting you and appreciated...
Art- I humbly stand corrected~ *bowing in abject penance*... I did read back through the messages and see that you never stated you intended to make your...
I want to keep it friendly here. First I must thank Art for doing a lot of CAD work for me on this scope that I wouldn't be able to do and can't release Art's...
Ed I'm getting a little (maybe more?) confused. When you say with a mirror of different focal length "you would have to generate your own drawings" do you mean...
Hi Gary! What I meant was my mechanical design dimensions would only be useful if you had a mirror of my focal length and copied my optical prescription. Ed ...
Point taken, Ed- and my apologies to you in particular. This is your group, and I greatly respect the work you've done in developing this scope. My hat is off...
Thanks Wes. Ed ... your group, and I greatly respect the work you've done in developing this scope. My hat is off to anyone who creates and refines an optical...
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