Ed, anyone, I hope it's okay to just jump in... I've been trying, on and off, to figure out how to use OSLO LT (is this what I should be using if I can't spend...
Gary, I believe that Oslo Light is the best free raytrace program out there but I admit I'm not very proficient with it yet. It's big limitation is only 10...
Thanks Ed, The OSLO group looks to be on life support with the last remotely relevant post in April. Too bad. Anyway, 10 surfaces seems like plenty for me at...
Gary, A lot of my designs have more than 10 surfaces so Oslo Lt won't be of help. You can subtract the first surface on many of mine because I stick an extra...
Did you know you can buy a Surplus Shed 4 inch f/20 mirror and a couple of OptoSigma lenses to make a scaled down version of my window telescope or fold it to...
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...
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