Image of the day

From the
ATWB Customer Gallery

Great Horned Owl

My Account

New to Astromart?

Register an account...

Need Help?

Which diagonal should I use?

Started by brucesdad13, 01/10/2015 01:11PM
Posted 01/10/2015 01:11PM | Edited 01/10/2015 01:13PM Opening Post
Dear ones, I received two diagonals with my C8: a 1.25" and a 2". I have 1.25" EPs. The thought occurred that perhaps the 2" with 1.25" EP adapter might be better quality than the 1.25" diagonal.

Celestron Star Diagonal 1 1/4" #94115-A
vs
Celestron 2" XLT Schmidt-Cassegrain Diagonal #93527

I don't know much about the 1 1/4" ... will look up the model #. The 2" came in a fancy box inside of which is a luxurious looking hard case which made me think perhaps this diagonal might perform better....

Edit: I also noticed that the 2" has a threaded ring which looks like it would hold on more securely than the smooth part of the 1 1/4"

~ Charlie Stevenson

8" f/5.7 String Telescope - 1st Scope Build; 2nd Place Stellafane 2016 Optical Award for Newtonians 12.5" and Smaller
10" f/4.5 Newtonian (June 2015) mirror refigured by Optic Wave Labs P-V WaveFront 1/14.24, Strehl Ratio 0.993 (Aug '15)
Criterion RV-6 seems to be circa 1973 (June 2015) [For Sale]
Celestron C8-A XLT (January 2015) [For Sale]
Celestron PowerSeeker 70AZ (Christmas 2014)
Aldrich Astronomical Society member since 2015
http://astro.charleskelleystevenson.com/
Posted 01/10/2015 01:38PM | Edited 01/10/2015 02:03PM #1
Nevermind... having compared the two the answer is clearly the 2". Even the price will tell you $34 new vs $130 new. I'm so green to all this that I didn't at first realize the 2" worked with 1.25" EPs. Now on to this polar axis finderscope business. It's already installed when I received the mount. I mucked around with the dials without realizing what it was... haven't used it yet. Is it worth aligning the axis and using this at night? I feel like I'm answering my own question as I type this.. It is probably best since my GPS and other electronics seems to fail in 10F weather.

~ Charlie Stevenson

8" f/5.7 String Telescope - 1st Scope Build; 2nd Place Stellafane 2016 Optical Award for Newtonians 12.5" and Smaller
10" f/4.5 Newtonian (June 2015) mirror refigured by Optic Wave Labs P-V WaveFront 1/14.24, Strehl Ratio 0.993 (Aug '15)
Criterion RV-6 seems to be circa 1973 (June 2015) [For Sale]
Celestron C8-A XLT (January 2015) [For Sale]
Celestron PowerSeeker 70AZ (Christmas 2014)
Aldrich Astronomical Society member since 2015
http://astro.charleskelleystevenson.com/