Hello, I have just wired my SkyCom up to the 12vdc supply that I installed to run my DewGuard and the ServoCat. When I check the current draw, it was only...
Hi Bill, Thanks for the info, I have an older manual that does not mention the thermostat, guess I'll store it in the 'fridge for a while and see if that...
Hi everyone, I'm thinking of getting the 18mm U.O. ortho to use on mag. 9-11 Galaxies. I observe in a light polluted mag. 5.0 sky. Will use it with a Lumicon...
I think you'd be better off with higher power. I have a 12.5" F5 about 64" focal length. I use a 19mm to find things (x85) then switch to a 9mm (x175)or even...
I think you will be pleasantly surprised by the improvement in contrast. It's hard to beat a goold old ortho in that regard. Plus, they are reasonably priced....
Rob's point on resale is correct, but with a 22 and 17mm in the box I don't think there's going to be a huge improvement contrast wise with an 18mm. Usually...
Helix is selling these for $185 shipped a good price for this much afov if the eyepiece is good. Since under 20mm is "friendly territory" exit pupil wise on...
Hi Kyle, I'm a big fan of both the UO orthos and Nagler eyepieces. I have plenty of both that I use all the time in my 18" Dob. I like to believe that I am...
I use my 12.5" f/6 at a site with a NELM of ~ 6.0 - 6.3. I quite often use the UO 9 Ortho to view galaxies. I have on a couple times compared the 9 Nagler...
Thanks for all the responses. I decided that I'm going to GO FOR IT! However, I'm going to go with their new HD (High Definition) version that is fully...
Well don't forget to check out the sky and moonglow filter on the astrophysics page. It may do ya better than the Lumicon. Hope you enjoy the eyepiece when...
I'm curious as to how it is that one can get a higher magnification and same fov. Any example will do, but take for example an 80mm refractor, f/7, a 32mm 52...
... For much simpler numbers, let's use the same scope, 80mm f/7, and 2 eyepieces--a 20mm with 82 degree afov and a 40mm with 41 degree afov. Although the 20mm...
Vic, ... This is true for an extended object. However, as I understand it, a point source will maintain its brightness as magnification is increased, at least...
From those who have studied from both books, which one would you recommend for me to read first, Texereau's book or Suiter's? Eventually, I'll read both. ...
Depends on what you want to do... Make a Newtonian with some background information on Newtonian optics, or Star test a telescope you already own, with...
... I've always understood an Airy disk does have size--defined by the resolving power of the aperture. Therefore, although a larger aperture does collect more...
Well Rutten and Van der Rooij's Telescope Optics is also good, and probably as important as the other two for a "good education." I believe that Texereau's...
... I've read that the human eye can detect the threshhold resolving power of a given aperture when the magnification reaches about 13 to 16 power per inch, or...
Well Vic I think we are saying the same thing. If I have a 4 inch saucer and an 8 inch plate the angle of movement that my eye will describe in looking over...
If there ever was such an era. As Von Neumann put it, "Any one who thinks a machine can generate random numbers is living in a state of sin." Steve Truitt ...
The Suiter book that I know "Star Testing Astronmical Telescopes" does not describe "How to Make a Telescope" as Texereau's does. They are about two different...
That's true. But there's truly random and then there's random enough to look random. Which is what one would be striving for on a grinding machine. Taking...
For a good description related to this subject see: Mel Bartels http://members.efn.org/~mbartels/aa/visual.html Dale Eason ... magnification ... under ... ...
Hi Obsessed, Anyone out there can tell me how Kevlar stands up to moisture & heat ?? Is it superior to the original one that comes with the scope & alignment...
... (inverse ... detail, and ... contrast is more ... encounters the ... An even likelier (at least to me) explanation is that as the background gets darker,...
... Yes that is true. In fact that is the reason why a 4 inch apo of good quality shows stars of magnitude 14+ whereas often a side by side 8" SC does not....
... Damn! It would appear Yahoo Groups ate my last post! I'll summarize: I've read Clark, to quote: "High power reduces the surface brightness of both the sky...
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