Current Price: $39.00
Buy It Now Price: $39.00
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Did you know that most telescopes work well for daytime viewing
as well as for astronomy? If you have a refractor or a catadioptric
telescope (the Schmidt-Cassegrain is the most popular example), and you
would like to use it for terrestrial observations, the most useful
additional accessory you can buy is an erect-image diagonal.

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.

Luckily, this is an easy problem to correct. Simply remove the
standard diagonal from the telescope’s focuser or visual back, and
install the Celestron 45º Erect Image Diagonal. Now, when you insert an
eyepiece, objects will be right side up and left-to-right correct. The
45º angle of this Amici prism diagonal is very comfortable for daytime
observations, where the telescope is often in a horizontal position.

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

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Filed under: Eyepieces & Accessories