The Telescope Tube; The Erect Image Diagonal (Refracting Telescopes Only) - Celestron ASTROMASTER EQ Instruction Manual

THE TELESCOPE TUBE

The telescope tube attaches to the equatorial mount using
a quick release dovetail system For all of the refractor
telescopes and the 76 mm Newtonian, the dovetail is
attached directly to the telescope tube For the 114 mm and
130 mm Newtonian telescopes, the dovetail attaches to tube
rings that hold the telescope tube
1 . Loosen the two mounting knobs located on the side of
the dovetail mounting bracket on the top of the equatorial
mount Make sure they are backed out far enough for the
dovetail bar to slide into the mounting bracket
2 . Slide the dovetail bar on the telescope tube into the
mounting bracket, making sure the dovetail is fully
seated inside the bracket
3 . Tighten both mounting knobs to hold the telescope
in place
THE ERECT IMAGE DIAGONAL
The erect image diagonal attaches to the back of a refracting telescope and contains a small prism that reflects light at
a 90° angle, providing a more comfortable viewing position Most astronomical telescopes will give a view that is either
inverted or reversed left-to-right The erect image diagonal corrects the image so that you will have a 100% correctly
oriented image, making your telescope perfect for daytime terrestrial observing
To insert the diagonal on the AstroMaster 70EQ and 90EQ
refractors:
1 . Remove the caps from both sides of the diagonal
2 . Loosen the setscrews on the back of the focuser and
pull out the small dust cap
3 . Insert the smaller tube on the diagonal into the back of
the focuser and secure it by tightening the setscrews
You can adjust the angle of the star diagonal to any
desired direction before tightening the screws
NOTE: An erect image diagonal is not able to reach focus on a Newtonian telescope. The image will always appear upside-down. The Newtonian telescopes come
with one special 20 mm erecting eyepiece that has an erecting prism built-in for terrestrial use.
(Refracting telescopes only)
Mounting Knobs
ENGLISH I 9