Hi, I have a visual back that is only 1/6" in length that can accept 1.25" accessories before it hits a rear field flattener glass. I need a 1" extension to...

1, 2, 3, 5, 7... PRIME Numbers ________________________________ Definitions What is a PRIME Number ?

........ for this idiot Manuel Joseph Din to get something right even by statistical chance alone! The only thing right about this guy is that he is never...

Hi, In determining the size of the airy disc in diameter, do you use: 1.22 * wavelength * f-ratio or 2.44 * wavelength * f-ratio?

Anyone know where I can buy a 1.25" or 2" focuser that'll properly fit my 60mm refractor? It's a Jason 60x700mm...made in the mid 1980s...made in Japan...came...

Does anyone sell a 1.25" Crayford focuser besides Jim's Mobile? The JMI models have a fixed base radius that does not match my scope and they won't machine a...

My son is using a UO 1.25" helical focuser on his homemade 5" f/11.4 newt, and this is a pain in general, and especially so for imaging. I am looking to get...

Trying to decide between a 1.25" focuser or a 2" for my 8" f/6 dob. Price is a concern, but hopefully, someday I'll be able to afford a Nagler or 2. Right...

What is the magnification ampilfication factor (I know the current 2" model is 1.15x)? I have read the only 50 of these were produced. Is is...

Hi, Do plumber or hardware stores have tubes where you can insert an eyepiece or exactly 1.25" in inside diameter? What particular brand of plumber (or...

As a astro-newb and soon-to-be owner of an 8" Dob (which for those not familiar, can accommodate either 1.25 or 2" eyepieces & accessories), I am clueless as...

http://www.newscientist.com/article.ns?id=dn7511

What does 1/10 wave mean when speaking about primary mirror quality?

http://www.msnbc.msn.com/id/26857144/

Hello. Several years back I purchased a Celestron FS80 EQ WA (one of the many 80mm f/5 clones). It has proven to be a great grab-and-go scope at a very...

I've seen a couple of Intes MK66's advertised - one 1/6 wave and the other 1/8. The 1/8th should be better, but could someone give me an idea of what the...

I meant to pose this for just Nov., but anyone want to try for it? I'm thinking of fairly moderate scopes 4-12", and not professional observatory scopes. Are...

Hi there, On my computer star globe, there were 10 solar system bodies lined up near the sun, in line of sight. At 12:41 pm GMT on 8th January 2008, from UK...

Taken on July 10, 2003. http://web.tampabay.rr.com/jsuro/10daymoon_07102003.htm Take Care, JAS

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