Just curious to learn how dark the sky is where others in this group regularly observe. I live about 12 miles SW from the Calgary city centre and have only ...
I have fifteen million neighbors just to the north of me in Orange and Los Angeles counties. To the south is a nuclear power station, with lots of lights and...
Hi Gregg; Check out the Orange County Astronomers there web site is http://www.OCAstronomers.org They have a 22 inch scope out in Anza with pads for the...
I live in northern Utah about 100 miles from SLC right on the Idaho border. I get some glow from Logan - 25 miles south - and SLC. One dairy about a mile...
There are national parks in Utah where people go for dark sky viewing. Bryce, Capital Reef, Arches, and Big Basin(over in Nevada) are all great spots. But...
Yes, I have been to all those places. But now I avoid national parks,RV capable roads, and any place the general populace prefers. I much prefer the two...
http://www.inquinamentoluminoso.it/worldatlas/pages/fig2.htm Also go to the Clear sky clock home page and find the clock for an area of interest. Look for the...
I'm not positive, but I think that's a type of cellular mirror made by combining flat "slats" of glass, resting on their sides and arranged in a (usually)...
Greg For a good explaination of sandwich mirrors, Google: "Hubble optics", thier site explains it rather well! Good points are-fast cool down times &...
What are this groups thoughts on the best current supplier of enhanced mirror coatings in the 98% reflective range? Are they worth the extra $$? Do I...
Hi Group First, I would like to thank all of this groups regular posters. You are all a great bunch of informative people. My question is what do you use to...
... Remember that "sandwich mirror" has become a specific reference or name to only those type of cellular mirrors made for Hubble Optics from a Chinese...
To clean the glazing off of ebony star, I'll use some fine steel wool and lightly scrub the surface with quick, short strokes. Then I'll wipe it with a clean...
Hi. I have a 24" Tectron with the stock Tectron t-shirt material shroud. It lets in a lot of light and I would like to make a new one. What is, and where do I...
I use mineral spirits / paint thinner to clean it. But, hey, its a laminate - any solvent/cleaner that doesn't leave a residue will work. Then I rub in a...
Ric has a point! The bad points I stated in my post about sandwich mirrors are for Chinese made sandwich mirrors for Hubble optics based at Arlington,...
... Right. ... Another way to compare is "equivalent aperture". Since area is proportional to the square of aperture, then the "equivalent aperture" would be...
For an extreme difference: Home sky brightness in LA averages magnitude 17.5 per sq.arc-sec. My observing site on Mt. Pinos averages 21.4 Talk about extreme! ...
I've seen what the extra reflectivity does for deep-sky viewing, so I'd say to go for it. Most mirror coaters also do enhanced coatings. There are about 25...
Jamey: We offer a 96% enhanced aluminum coating. Contact me off line if you are interested... James James Mulherin President/Lead Optician Optical Mechanics,...
Thanks to everyone for the information and confirmation. Jamey ... From: jcmulherin To: bigdob@yahoogroups.com Sent: Saturday, March 07, 2009 10:10 Subject:...
Paint thinner will leave an oily residue on the surface. If that is good or bad, is up to you. I heard Denatured Alcohol works the best. But I use plain...
Geoff; I shopped around, looking at quite a few shrouds and opted for the AstroSystems. It is some kinda spandex. Its stretch keeps it out of the optical path....
I just ordered one from Heather at Teeters telescopes along with a pole bag, I first went astrosystems but after they didn't answer 2 of my e-mails I went to...
I just got mine from Heather also and a truss bag. You can go to the site and see a piture of it (Obsession with a red shroud). Very good workmanship and fast...
I have to second Jamey. I had a t-shirt shroud and changed to the Astrosystems one. It is great. I set up my scope, called them and gave them all of the...
I use fine Steele wool on the Teflon, a trick I learned from a real old guy astronomer. It gets the embedded dirt out. I just clean the Formica with Windex....
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