Is it true that a 50% solution of 99% isopropyl alcohol and distilled water (1:1) makes a good lense cleaner? Does it affect coatings?

I am considering purchasing a copy of Charles Wood's THE MODERN MOON: A PERSONAL VIEW. I currently have a copy of Gerald North's OBSERVING THE MOON and am...

"Ashley Waterstein" wrote in message ... As you can tell, I'm...

Seems there isn't any worthy review material so to speak about this 2.00" 5-element FMC eyepiece. The number crunch suggests a great match up to F-8 and...

Hi, I have been following the thread on bad mirrors from a premium vendor, and I have to agree that sometimes good vendors put out bad mirrors. I had the...

Can someone help identify this eyepiece design: 6 elements in 4 groups; from field lens to eye lens they a Biconcave doublet Biconvex singlet Biconvex...

With all this tripe and hype about triplet apos, I'd just like to speak up on behalf of all those long focus ED scopes put out by Vixen, and anywhere else from...

Wfoley2 wrote: Sorry about an OT, but you may need to see this (maximize screen): ...

Which provides more stability for a GP class mount, a set of oak legs a la Al's Astro, or an SVP pier? -Stephen

Please help. I read somewhere on the web that there will be an effort to image the entry of Huygens probe into Titan's atmosphere from Earth-based large...

I sold my Ultima 8-PEC today, along with all the bells and whistles that I had added to trick the scope out. I sold it to a local New Englander, astronomer,...

Hi, NASA's GSFC website moved today ! http://www.nasa.gov/centers/goddard/home/index.html and update your bookmarks......

Hi all- I'm looking at picking up the 300d for doing both astro and daylight work. I've never owned a digital camera and am curious about the...

Tuesday morning, Dec. 7th (0245 CST), our waning crescent moon will occult Jupiter (visible from most of North America). Comet Machholz should be shining at a...

Hi all, I'd like to understand why magnification and focal lenght are related, why a Barlow lens is able to do what it does, how EP's work etc. Pref. nothing...

Hi, sorry if this is the wrong place to post this, but I am having trouble identifying something ive been observing over the last few weeks. It appears to be...

here is the answer from Keck: Rolando, I think the markings in your images must be due to something other than surface features on Titan, because they appear...

It is my suspicion, therefore, that a refracting telescope based on H. D. Taylor's design _would_ provide views of the heavens that were absolutely...

John Savard wrote: This was, therefore, a true apochromat. But it did not have a fluorite element. It did not use glasses like KzFS1, because they...

http://www.news.com.au/common/story_page/0,4057,11483286%255E13762,00.html Found this on Collegehumor.com Pretty damn cool, if it's real. What do you...