HI Ed, To step in here, what f/ratio would I need for a 4 inch with no correcting lenses for a Herschelian scope? And is there a mirror source? ...or is all...
Thank you,, Ed .. Maybe a stick OTA first.. Simple is good, because I do not have the ability to have anything more complicated.. To find a mirror with those...
Both mirrors on my 6" Schief were ground and polished to 220" radius. The tool for grinding and polishing the Primary became the secondary after being...
Thank you, Art. Is a diagram in our files? Have you posted any pictures, anywhere? Terrific posting ,answers some of my questions, too..Have made a 6/f8 and a...
In the files, the first one, "Kutter Type Schief", what is "Thickness" I believe we understand all else. BTW, where can I find a complete outline, a web site,...
Pete, The thickness is the same as airspacing, negative is right to left, positive left to right. ... I'm not sure what you're looking for but if you Google...
Hey Ed!! 1) Am I understanding correctly that your Yolo designs do not warp either mirror nor require a toroidal figure? 2) The 6" design looks to me like it...
Ed, Thank you, that Will be a big help. I'll Google Kutter..and also see the original Sky article. Pete ... Looking for last minute shopping deals? Find them...
Hi Chuck! ... Correct, it has no cylinders, toroids or warping. ... You're reading to much into it, there won't be a difference that you can see between the...
Hey Ed!! I'll try to keep it below 10 ;-) 1) Where do you get the "optisig" or "optosig" lenses? I googled both spellings but couldn't find a lens company....
Chuck, ... Good, no 60 questions. ... Look in http://www.optosigma.com. They'll cost $63 & $67 coated. ... I made them myself, there's not a big selection...
I had to replace the primary on my window scope due to an "incident and I got the replacement back from the coater and into use yesterday. I'll have to adjust...
hi ED i live in pa i was wondering if you have a local club that grinds glass i an not sure it there is any around here i live 1.5 hours east of pittsburg...
Kevin, There is only astronomy clubs around here. Myself and one guy in our astronomy club are the only ones making mirrors that I know of. Ed Jones ... hours...
Hi Kevin, I'm in Easton and unfortunately don't know of anything west of here. The DVAA is a bit west but I don't think they have any organized ATM activities;...
thanks GARY i thoight it would be nice to have a club where we could test mirrors and talk about diferent telescopes/. not many people interested in making...
hi ED I was reading on cloudynights you were saying that using a coma corrector and a hyperbolic primary you would get a better image . How much better image...
Kevin, A 26 inch is quite a project! Yes a coma corrector will introduce some spherical which can be improved by overcorrecting the primary. One thing to keep...
hi ED thanks for this group just wondering if your CHIEF telescope uses a flat secondary i have a 10 f 8 mirror collecting dust and thought it might work ....
You know I thought the CHief couldn't be any faster than F/7 but newver really tried it. It just tried F/6 on an 8 inch and got a Strehl of .979. Wow!...
... hi ED does each different chief use the same corecting lens only the spacing is different or does each need a diferent lens. also do you keep the...
Kevin, Yes the secondary needs to be as far as possible to keep the primary tilt small but the correctors want to be as far from focus as possible. So there...
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