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ENGLISH I 9
THE ERECT IMAGE DIAGONAL (Refracting and Maksutov telescopes only)
The erect image diagonal attaches to the back of a refracting or Cassegrain 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 and the 90/127 Maksutovs:
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.
THE TELESCOPE TUBE
The telescope tube attaches to the equatorial mount using
a quick release dovetail system. For all of the refractor
telescopes, all the Maksutovs 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.
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.
Mounting Knobs
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