Nearly all refractors have spherical lens surfaces. You get correction for spherical aberration by choosing the correct radii for the different surfaces....
Sounds to me like a lot of marketing hype. The XLT series includes a Newtonian, 2 refractors and a Mak Cassegrain per a visit to the Celestron web site. They...
Yes it does mimic the AP900 on some points of design and indeed, not always the best: the azimuth is the old style and not upgradeable, the fork is the older...
Please help out the group by doing the following. Keep posts trimmed so the length does not get out of hand. This really helps those who receive daily...
Refractors@yahoogroup...
May 1, 2007 6:50 pm
21591
Hi Bill, The Omni XLT-102 looks like a beefed version of the older Celestron C102 while the XLT-120 looks like a beefed up version of the Orion Astroview...
Mark; Try using tinyurl.com to shorten the links down. I have found it to be a very handy tool and it is very easy to use, pretty much self explanatory in...
... Somehow I've never had much interest in any of the Tak scopes, and am far more inclined for something in the 155 to 160mm range. Clear skies, Alan...
Rob, Both my 8" f/6 and 8" f/8 now enjoy new homes. The 10" f/6s seem about perfect for the 1200 SMD, so a short pier and a cradle for the Newts is on my...
Rob, I have the 1200. I just need the short pier. <g> Clear skies, Alan ... From: "albireo13" <albireo13@...> To: <Refractors@yahoogroups.com> Sent:...
My first telescope was a 40 power Gilbert reflector. My second was a 60mm Unitron altazimuth. The Unitron came with a Unihex, and included an achromatic...
hi refractorians all over the world, I`m proud to announce, that my 9" TMB Apo desigend as a folded refractor, made it to NASA Apod. why do I post this here? ...
Alan; Seems to me that I have heard of some few batches of lead flint glass having this problem. Apparently had to do with a processing problem in manufacture...
Dietmar; Congratulations. Feel free to post photos of your setup and any technical information you would like to pass on. An article in the Files area about...
There is a write up of the new Ethos 100 degree AFOV eyepiece available here: http://www.televue.com/engine/page.asp?ID=2 This links to a technical write-up...
hi Rich, thanks! I will head Your call for the articles and post them here. in addition I`ll paste them into the files area. it will take some time. for all...
hi everyone, Rich asked for some articles covering the "anatomy" of the 9" TMB f/9 "N"-type folded Apo and how to collimate this system. so here we are: this...
I took my first look at the website pages for the Stellarview SV127 Dual Fluoro. Unlike most telescope triplets this one is said to have a flat field. Looking...
The SV is available with either the standard Taiwanese Crayford focuser, made by Long Perng as I recall, or the Starlight Instruments Feathertouch focuser. Yo...
Had the 102mm f/6.5 mounted on the c14 last night. While taking in M35 I saw this bright double arc that went the field of view in all the eyepieces. This...
The dispute about the FL53 vs Fluorite designation has been beaten to death here. Please no more on that. This post addresses the performance. I have been out...
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