Celestron 45° Diagonal Eyepiece (1.25" Erect Image)

Technical Details

Celestron 45-Degree Erect Image Diagonal Most telescopes, including refractors and catadioptric models such as the widely favoured Schmidt-Cassegrain, perform admirably for daytime viewing in addition to their astronomical applications. For those keen on terrestrial observations, an erect-image diagonal proves to be an invaluable accessory worth investing in.

Key Features

• Corrects image orientation for terrestrial observations
• Easy to install
• Comfortable 45° angle for daytime observations

If you look through your telescope with the standard mirror or star diagonal installed, you will notice that objects may be either upside down, flipped so that you see a mirror image, or a combination of the two.

This is fine for observations of celestial objects, but it can be a little confusing when you are trying to track a boat as it moves through the water, or an eagle as he flies towards his perch.

Please Note: Adding an erect-image diagonal to a Newtonian reflector will not result in images that are right side up and left-to-right correct. The optical design of a Newtonian will always produce images that are rotationally off in orientation.

This does not mean that you can’t use a Newtonian reflector during the day, it just means that you have to get used to objects oriented in unrealistic positions.