Hi there Not much happening here, but anyway I have some info on our Schiefspiegler project in Denmark. At the moment we are making the mirror for seven 4"...
Yes please keep me updated. I just posted a picture of my 12 inch CHief OTA. It don't have optics installed yet but they are finished. I need to coat the ...
Finishing any telescope seems to take forever. I've mirrors and lenses for 5 different new optical devices. The new Schiefspiegler cradle is waiting too so...
None of the "below" (sic!) The tool that was used to grind the primary spherical was itself polished and figured to the same exact RC, then a section of it ...
Yes. F/32. That's very close. 4704mm F.L Great scope. Fantastic contrast. Equally fantastic magnification without the expense of high-quality, low digit EP's....
Hello everyone! I've been following with interest the endeavor Lars Zielke and his associates have undertaken to make a number of David Groski's DelMarva ...
I think I would rather build a 4 inch CHief. At f/10 the field is much wider, it's a shorted OTA only 29 inches between mirrors and you can still buy the...
I've almost finished my current project, an 8" F/6.25. I have over a half dozen other ATM projects to choose from. One of them involves making a lighter,...
I Managed to find a string at Cloudy nights where Mark Harry addressed this problem. The consensus was that it can't be done given the pre-existing optical...
... Art, The Schief has a naturally long focal length and high f number. I don't think it will be likely that an off-the-shelf lens to do what you want. You...
Hi Ed!. I AM rebuilding the Schief! The cradle is overbuilt and thus overweight. It's getting a far better design made from low density structural foam and...
Art, No you can't use your comvex secondary, a Yolo needs a concave secondary which you'll have to make and I would need to design. I would really recommend...
I am in the process of making more simplified optical layouts for those who aren't familiar with the Zemax data. These are the BMP files. Also note that some...
... Thanks Ed! I really enjoy contemplating your designs. I would like to attempt something in the 6"-8" range for planetary observing. What would you ...
... Well I suppose the easiest to make would be the CHiefspiegler since you can buy optics for it. It depends on the f number you want too, they go from >F/20...
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...
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