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Celestron EdgeHD 9.25 Manual

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The visual back is the accessory that allows you to attach all visual accessories to the 8" telescope. The 8" telescope optical
tubes come with the visual back installed. If it is not already on the tube it can be attached as follows:
1. Remove the rubber cover on the rear cell.
2. Place the knurled slip ring on the visual back over the threads on the rear cell (Fig 1-1).
3. Hold the visual back with the set screw in a convenient position and rotate the knurled slip ring clockwise until tight.
Once this is done, you are ready to attach other accessories, such as eyepieces, diagonal prisms, etc.
If you want to remove the visual back, rotate the slip ring counterclockwise until it is free of the rear cell.
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The star diagonal is a prism or mirror that diverts the light at a right angle to the light path of the telescope. This allows you
to observe in positions that are physically more comfortable than if you looked straight through.
To attach the 1.25" star diagonal onto the 8" optical tube:
1. Turn the set screw on the visual back until its tip no
longer extends into (i.e., obstructs) the inner diameter of
the visual back.
2. Slide the chrome portion of the star diagonal into the
visual back.
3. Tighten the set screw on the visual back to hold the star
diagonal in place.
If you wish to change the orientation of the star diagonal, loosen
the set screw on the visual back until the star diagonal rotates
freely. Rotate the diagonal to the desired position and tighten the
set screw.
To attach the 2" star diagonal onto the 9.25/11/14" optical tubes:
1. Remove the visual back from the rear of the tube.
2. Attach the threaded ring of the 2" diagonal to the rear cell of
the telescope.
3. Loosen the thumb screws on the side of the diagonal and
remove the 1.25" adapter from the barrel of the diagonal.
If you wish to change the orientation of the 2" star diagonal, loosen the
retaining ring that attaches the diagonal to the rear cell. Rotate the
diagonal to the desired position and tighten the retaining ring.
1.25" Star
Diagonal
Visual Back
Eyepiece
Figure 1-1 – Visual accessories for the 8"
2" Mirror
Diagonal
2 inch
Eyepiece
Figure 1-2 – Visual accessories for the 9.25/11/14"
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