The Eyepiece; Focusing; The Star Pointer Finderscope - Celestron NexStar 114 Instruction Manual
Celestron nexstar 114: instruction manual
Hide thumbs
Also See for NexStar 114:
- User manual (241 pages) ,
- Instruction manual (50 pages) ,
- Owner's manual (16 pages)
Table of Contents
Advertisement
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
either directly into the focuser (114mm and 130mm models) or into the star diagonal (60mm and 80mm models). To
install the eyepiece:
For 60mm and 80mm models:
1.
Loosen the thumbscrew on the star diagonal so it does not obstruct the inner diameter of the eyepiece end of the
diagonal. Remove the protective dust cap from the star diagonal's barrel.
2.
Slide the chrome portion of the low power 25mm eyepiece (20mm for the NexStar 60 model) 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.
For 114mm and 130mm models:
1.
Loosen the thumb screw on the eyepiece adapter at the end of the focuser barrel and
remove the protective dust cap from the focuser barrel.
2.
Slide the chrome portion of the low power 25mm eyepiece into the eyepiece
adapter.
3.
Tighten the thumbscrew to hold the eyepiece in place.
To remove the eyepiece, loosen the thumbscrew on the eyepiece barrel 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 focuser. The NexStar uses eyepieces
with a standard 1-1/4" barrel diameter.
F
o
c
u
s
i
n
g
F
o
c
u
s
i
n
g
To focus your telescope, simply turn either of the focus knobs at the eyepiece end of the optical tube (see figures 2-3
and 2.4). Turn the focus knob until the image is sharp. Once sharp, turn the knob towards you to focus on an object
that is closer than the one you are currently observing. Turn the knob away from you to focus on a more distant object
than the one you are currently observing.
T
T
h
h
e
e
S
S
t
t
a
a
r
r
P
P
o
o
i
i
n
n
t
t
e
e
r
r
F
F
The Star Pointer is the quickest and easiest way to point your telescope exactly at a desired object in the sky. It's like
having a laser pointer that you can shine directly onto the night sky. The Star Pointer is a zero magnification pointing
tool that uses a coated glass window to superimpose the image of a small red dot onto the night sky. While keeping
both eyes open when looking through the Star Pointer, simply move your telescope until the red dot, seen through the
Star Pointer, merges with the object as seen with your unaided eye. The red dot is produced by a light-emitting diode
(LED); it is not a laser beam and will not damage the glass window or your eye. The Star Pointer comes equipped with
a variable brightness control, two axes alignment control and mounting brackets. Before the Star Pointer is ready to be
used, it must be attached to the telescope tube and properly aligned:
i
i
n
n
d
d
e
e
r
r
s
s
c
c
o
o
p
p
e
e
13
Star Pointer
Eyepiece
Focus
Knob
Figure 2-4– Visual accessories for the
NexStar 114 & 130
Hide quick links:
Advertisement
Table of Contents
