The two mirrors on my 6" Schiefspiegler are tilted in a fashion similar to yours and thus provide obstruction and defraction free images with excellent...
There has been so much positive dialogue about the performance of Ed's CHiefspiegler design that something positive appears to have been overlooked. IMO,...
Hi, Art. Yes, the absence of an upper cage assembly and large elliptical flat (I assume that's what you're point at) is an attractive feature of a Chief. The...
Roger, If you ray trace Herschel's 18 inch scope it has a horrible image yet we know Herschel was observing very fine detail much better than we should expect....
Art, The Kutter uses the secondary tilt to reduce the astigmatism and coma of the tilted primary. Unfortunately the tilts need to correct the astigmatism and...
Roger, Very interesting that he had some negative singlet lenses! Any mention of how he used the negative lenses? Can I get a copy of your paper when you...
Hi, Ed. I'll send my ATS powerpoint presentation in a few days. Please send me your private email. The formal paper will not be finished for some months. He...
I was going to wait until people responded to the added lead weight issue before bringing up yet another CHief advantage, but yes, as designed by Kutter or...
I'm getting ready to try my lens curve generator. A friend made me a spindle I could put on my drill press base to spin the lens. My drill press head tilts to...
The CHief idea has me thinking of redoing a scope I currently have... I have an 8" f5.75" mirror. Of course the idea of 8 inches unobstucted appeals to me. I...
i have a small magnetically mounted spritzer that sticks to the arm above the table on my milling machine. It has a small regulator screw to adjust the amount...
welcome you are at the right group if you wont to make a CHief // kevin frederick ... From: timo4352 <timo4352@...> Subject: [spiderless] Where to...
Hi Art, I got it figured out, a jar setting on a shelf and an IV line dripping water. It worked great. I removed 1/2 inch of sag from a 5 inch convex test...
Hi Tim! Welcome to spiderless. Starting out on a f/5.75 may be a hard road. It can be done but for one thing you'll have to make one lens. If you can find an...
... Hi Ed: Congrats on making this work. Can you tell me/us what the apprx rpm was on the generating tool on top (in the drill press chuck) and on the bottom...
Tim wrote: ". . . . the idea of 8 inches unobstucted appeals to me. I have no idea where to start, though. Would this mirror be good for the project?" I am not...
Hi Tim, At last year's Stellafane we spent a good amount of time with Ed and his CHief and had some excellent viewing conditions. We were impressed by the...
Michael, The bottom spindle can run pretty slow maybe 120 rpm and I was using maybe double that speed. My drill press has a 1725 rpm motor with a 4 gang...
Though not a big as some are making I am putting together a 6 inch f/12 Chief since I already had the optics. I posted pictures in the photos. I didn't realize...
Good morning Ed! One of the things that I would love to see are a few formulas, equations if you will that would determine all the critical spacial...
Aperture and speed make up the golden chalice of astronomy. Planetary telescopes are, however, slow. I'm not certain what the driving reason is for this...
Hi Art, I uploaded the 6 inch f/12 Chief prescription into the files section. It is pretty much a clone of my 12 inch so maybe you can send me an unlabeled CAD...
Here you go, build a 6 inch Chief and you don't have to polish any glass. I uploaded a 6 inch f/8 Chief design using all commercial optics. You can just buy...
Hi Ed, Our astronomy club has an amateur made 8" f/8 newtonian that has perhaps the most perfect mirror that our TM group has ever tested. It was donated to...
Randy, There are a couple of issues with scaling it up. First the aberrations also scale up. In the 6 inch the C,F & D wavelengths all fall within the Airy...
Hi Art, ... I could agree to some aspects of your statement if the word "astronomy" were used interchangeably with the words "celestial photography." Fast,...
Like me! I'd like to investigate the Chief design with something simple and off-the-shelf. I want to better understand how this 6" f/8 compares to a standard...
Brandon, I uploaded the same performance diagram for a Newt under files. I also uploaded a file called Chief vs Newt. The Chief and Newt are very similar, they...
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