Hi Tony! Last February, when sharing my criteria for choosing telescope designs, I listed these: 1. Novelty of the design 2. Ease of making the optics. 3....
Hi, All. Here are three links to astrophotos taken with a 12" (300mm) catadioptric Schiefspiegler. First, a well-known shot of the Eskima Nebula. Note that the...
Art, For DSO imaging you'll never go wrong with a mono-CCD from SBIG and a good filter set. I don't know if that's within your budget or not but do it if you...
Hi Tony! Thank you! I'll check it out but I'd sooner have a CCD that does not require filters. For one thing, the Chief is a Dob mount and while I could build...
... From: Art Bianconi To: spiderless@yahoogroups.com Sent: Tuesday, March 10, 2009 8:13 AM Subject: Re: [spiderless] Digest Number 117 Hi Tony! Thank you!...
Chamfering mirrors is a common practice, urged by pros to minimize the prospect of chipping. I am in the process of designing an instrumentation port that is...
Is a chamfer usually a flat angled surace between two flat angled surfaces? I think a gentle curve with no angles between the two surfaces would be likely less...
... Art: There is a spec on the angle between two surface (like the spherical surface of a lens or mirror and the outside diameter) in MIL-O-13830A and is was...
Art, The name of this effect is called the "Twyman effect" caused by stress relief in the glass you are grinding. I haven't read much about it, don't know how...
... Kevin, There are a whole bunch of unobstructed telescope designs that work at least on paper or by raytracing. I've posted a number of them in the files...
You are correct Peter: a radiused fillet is a common method for reducing the concentrations of stresses normally found at a vertex. If one is dealing only with...
Thanks for the reference Michael. I appreciate the effort you expended in researching it. Before I had the chance to calculate the chamfer, the client popped...
To: spiderless@yahoogroups.com From: artbianconi@... Date: Fri, 17 Apr 2009 03:19:28 +0000 Subject: [spiderless] Re: Whats the name of the principle...
That's it! "The Twyman Effect"! BTW, there is a four to six week wait on the structural foam I'm using in the composite panels (3/8" Divinycell 3 lb density)....
That's it! "The Twyman Effect"! BTW, there is a four to six week wait on the structural foam I'm using in the composite panels (3/8" Divinycell 3 lb density)....
How do you test the quality of the CHief lenses? Before they closed down our plant I could just use the interferometer and lenses at work. I have an...
It could happen. I recently purchased a Dell lap top. The incentive to do so came when I chose to get my feet wet with imaging. Since planetary work is where I...
Hi Art! You will like an equatorial platform, they are great and easy to make. On mine I used 2 synchronous motors $19 from Herbach and Rademan driving 2...
Hi Ed! Why two synchronous motors? I know the DC to AC inverter you speak of. I remember the mods you shared with us at CN. I bought two of them for myself but...
Hi Art! I use two motors because they are relatively cheap but mainly because if I use different scopes with different balance points one motor can slip if the...
HI ed thanks for all the info //Can the using the test that uses a led at 100 ft and the small lens be used to test complete CHief // thanks for the test on...
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....
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