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Celestron ASTROMASTER 70AZ Manual

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Installing the Diagonal & Eyepieces ( refractor)
Installing the Diagonal & Eyepieces ( refractor
8
)
he diagonal is a prism that diverts the light at a right angle to the light path of the
ou
eyepiece adapter of the
the
2. to the diagonal and tighten
3. rsing the procedure
Figure 2-13
T
refractor. This allows you to observe in a position that is more comfortable than if y
looked straight through. This diagonal is an erect image model that corrects the image
to be right side up and oriented correctly left-to-right which is much easier to use for
terrestrial observing. Also, the diagonal can be rotated to any position which is most
favorable for you. To install the diagonal and eyepieces:
1. Insert the small barrel of the diagonal into the 1.25”
focus tube on the refractor – Figure 2-13. Make sure the two thumbscrews on
eyepiece adapter do not protrude into the focuser tube before installation and the
plug up cap is removed from the eyepiece adapter.
Put the chrome barrel end of one of the eyepieces in
the thumb screw. Again, when doing this make sure the thumb screw is not
protruding into the diagonal before inserting the eyepiece.
The eyepieces can be changed to other focal lengths by reve
in step 2 above.
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he eyepiece (or ocular) is an optical element that magnifies the image focused by
.
when
1. Make sure the thumbscrews are not protruding into the focuser tube. Then,
2. epiece is called an erecting eyepiece since it corrects the
Figure 2-14
3.
T
the telescope. Without the eyepiece it would be impossible to use the telescope
visually. Eyepieces are commonly referred to by focal length and barrel diameter
The longer focal length (i.e., the larger the number) the lower the eyepiece
magnification (i.e., power). Generally, you will use low-to-moderate power
viewing. For more information on how to determine power, see the section on
“Calculating Magnification”. The eyepiece fits directly into the focuser of the
Newtonians. To attach the eyepieces:
insert the chrome barrel of the eyepieces into the focus tube (remove the
plug up cap of the focuser first) and tighten the thumbscrews – see
Figure 2-14.
The 20mm ey
image so it is right side up and corrected left to right. This makes the
telescope useful for terrestrial viewing.
The eyepieces can be changed by reversing the procedure as described above.
… 8 …


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