Celestron Diagonal, Erect Image

by Celestron

Product Details

• Item Weight: 1 pounds
• Shipping Weight: 2 pounds
• ASIN: B00009X3UM
• Average Customer Review: 3.0 out of 5 stars  See all reviews (1 customer review)
• Amazon Best Sellers Rank:
  • #10 in Camera & Photo > Accessories > Telescope Accessories > Diagonals
• Date first available at Amazon.com: June 17, 2003

Product Description

Celestron?s Erect Image Diagonals are an Amici prism design. This design allows you to look into the telescope at a 45 angle, at images that are oriented properly, meaning the image is upright and correct from left to right. Use of Celestron?s .96" to 1-1/4" 45 Erect Image Diagonal on a telescope equipped with .96" eyepieces means greater versatility. This diagonal will allow you to use 1-1/4" eyepieces, to obtain a larger field of view and better eye relief. A 901-1/4" Erect Image Diagonal is available for those who prefer that angle. A Star Diagonal lets you view objects that are at a 90 angle from the direction the telescope is pointing, thereby allowing comfortable viewing when the telescope is pointed at, or near, the zenith (i.e. directly overhead). The resulting image is right side up, but will be reversed from left to right.

Customer Reviews

Most Helpful Customer Reviews

3 of 4 people found the following review helpful:

3.0 out of 5 stars A bit disappointed., July 22, 2009

By 

The Eye "<O>" (Northern Hemisphere) - See all my reviews

= Durability:3.0 out of 5 stars  = Fun:3.0 out of 5 stars  = Educational:4.0 out of 5 stars 

Amazon Verified Purchase

This review is from: Celestron Diagonal, Erect Image (Electronics)

I am a novice astronomer and bird watcher and the owner of a 6" Newtonian reflector telescope. I thought -- ignorant as I am about optics -- that this erect image diagonal would allow me to view both the moon and my local cardinals right-side up. Wrong! It turns out that when I use the diagonal the focal range of my scope becomes so restricted that its usefulness as an instrument of observation drops to nearly nada. I can see remarkable right-side-up detail at about 50 meters (or perhaps a bit more), but everything before and after this "window" is completely lost. To be fair, I am not yet an expert in combining optics so my setup may be the problem and not the diagonal.

I've placed the diagonal back in the box it came in (for now). Maybe I'll have use for it in the future (perhaps I can bait birds into the focal range of the scope). If you are new to telescopes I would caution you against buying things that look like they ought to work. It's better to talk to someone with experience who can tell you what will work with your equipment. Back to the drawing board for me.