The Star Diagonal; The Eyepiece - Celestron NexStar 8 Instruction Manual
Celestron nexstar 8: user guide
Hide thumbs
Also See for NexStar 8:
- Quick start manual (9 pages) ,
- User manual (241 pages) ,
- Instruction manual (74 pages)
Table of Contents
Advertisement
control go over the posts on the bottom of the cradle, and the opening in the back of the hand control slides over the clip inside
the fork arm.
Once the telescope is powered up, use the hand control to move the optical tube to the horizontal position:
•
Press UNDO. This will bypass the normal alignment procedures and will still allow you to control the telescope.
•
Use the Up arrow directional button to move the telescope tube until it is roughly parallel to the ground. This will make it
more convenient to attach the necessary accessories as well as remove the front lens cover and install batteries when they
are needed.
You are now ready to attach the included visual accessories onto the telescope optical tube.
T
T
h
h
e
e
S
S
t
t
a
a
r
r
D
D
i
i
a
a
g
g
o
o
n
n
a
a
l
l
The star diagonal diverts the light at a right angle from the light path of the telescope. For astronomical observing, this allows
you to observe in positions that are more comfortable than if you were to look straight through. To attach the star diagonal:
1.
Turn the thumbscrew 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 thumbscrew on the visual back to h
diagonal in place.
If you wish to change the orientation of the star diagonal, loosen the
thumbscrew on the visual back until the star diagonal rotates freely.
Rotate the diagonal to the desired position and tighten the thumbscrew.
T
h
e
E
y
e
p
i
e
c
e
T
h
e
E
y
e
p
i
e
c
e
The eyepiece, or ocular, is the optical element that magnifies the image
focused by the telescope. The eyepiece fits into either the visual back
directly or the star diagonal. To install the eyepiece:
1.
Loosen the thumbscrew on the star diagonal so it does not obstruct the inner diameter of the eyepiece end of the diagonal.
2.
Slide the chrome portion of the eyepiece into the star diagonal.
3.
Tighten the thumbscrew to hold the eyepiece in place.
To remove the eyepiece, loosen the thumbscrew on the star diagonal and slide the eyepiece out.
Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the
eyepiece barrel. The longer the focal length (i.e., the larger the number) the lower the eyepiece power or magnification; and the
shorter the focal length (i.e., the smaller the number) the higher the magnification. Generally, you will use low-to-moderate
power when viewing. For more information on how to determine power, see the section on "Calculating Magnification."
Barrel diameter is the diameter of the barrel that slides into the star diagonal or visual back. The NexStar uses eyepieces with a
standard 1-1/4" barrel diameter.
old the star
Figure 3-2 - The visual accessories
10
Eyepiece
Star
Diagonal
Visual
Back
Hide quick links:
Advertisement
Table of Contents
