Celestron Advanced Series C5-S User Manual
Page 12

12
 
 
• Finderscope 
• Finder Bracket 
• Rubber O-ring 
• Three Nylon Tipped Thumbscrews (10-24x1/2") 
• Two Phillips Head Screws (8-32x1/2") 
 
To install the finderscope: 
 
1.
Attach the bracket to the optical tube. To do this, 
place the curved portion of the bracket with the 
slot over the two holes in the rear cell. The 
bracket should be oriented so that the rings that 
hold the finder are over the telescope tube, not the 
rear cell (see Fig 2-11). Start threading the 
screws in by hand and tighten fully with an Allen 
wrench. 
2.
Partially thread-in the three nylon-tipped 
thumbscrews that hold the finder in place inside 
the bracket. Tighten the screws until the nylon 
heads are flush with the inner diameter of the 
bracket ring. Do NOT thread them in completely 
or they will interfere with the placement of the 
finder. (Having the screws in place when the finder is installed 
will be easier than trying to insert the screws after the finder has 
been installed.) 
3.
Slide the rubber O-ring over the back of the finder (it will NOT fit over the objective end of the 
finder). It may need to be stretched a little. Once on the main body of the finder, slide it up about one 
inch from the end of the finder. 
4.
Rotate the finder until one cross hair is parallel to the R.A. axis and the other is parallel to the DEC 
axis. 
5.
Slide the eyepiece end of the finder into the front of the bracket.
6.
Slightly tighten the three nylon tipped thumbscrews on the front ring of the bracket to hold the finder 
in place. 
7.
Once on, push the finder back until the O-ring is snug inside the back ring of the finder bracket.
8.
Hand tighten the three nylon tipped thumbscrews until snug.
R
R
e
e
m
m
o
o
v
v
i
i
n
n
g
g
t
t
h
h
e
e
L
L
e
e
n
n
s
s
C
C
a
a
p
p
 
The C5-S and C9.25-S have aluminum lens caps that slide on and off of the front of the telescope. The C8-S lens 
cap utilizes a bayonet-type locking mechanism to hold it in place. To remove the lens cap, hold the cover firmly and 
rotate the outer edge 1/2” counterclockwise and pull off. 
 
 
 
 
Figure 2-11
Finderscope
Nylon 
Adjustment 
Screw 
Finder Bracket
Rear Cell
