Image of the day

Captured by
Douglas Rollain

SH2-157_Seestar_S30_Pro

About Astromart

My Account

New to Astromart?

Register an account...

Need Help?

Advantage of using a 2" diagonal

Started by Vars191, 03/10/2009 06:30AM
Post Reply
Posted 03/10/2009 06:30AM Opening Post
Vaclav Novotny
View public profile Send a private message to Vaclav Novotny Find more posts by Vaclav Novotny Find threads started by Vaclav Novotny
Forum Member

Join Date: Oct 2008

Location: Capalaba, AU

Posts: 7

Hi All
What is the advantage of using a 2" diagonal over a 1.25" diagonal in a 80mm F7.5 scope other than being able to use 2" eyepieces?


Quote
Posted 03/10/2009 06:49AM #1
Philip Canard
View public profile Send a private message to Philip Canard Find more posts by Philip Canard Find threads started by Philip Canard
Forum Member

Join Date: Feb 2006

Location: Roundup MT, US

Posts: 128

It will support heavier accessories such as a TEC EP turret or binoviewer.

With shorter focal length EP's, you will never bring the edges of the mirror into play optically, and that is where most of the distortions occur.

It will cover the format of a 35mm camera and a 1.25" diagonal will not.

Phil
Quote
Post Reply

Funding Member

Sponsors


View all sponsors

Search