Celestron 21182, Instruction Manual

6 

CHANGING THE FINDERSCOPE BATTERY

To replace the StarPointer battery, remove the finder from 
the scope and turn it over. The battery compartment is 
located directly under the large lens assembly. Using a 
small screwdriver or your fingernail, gently lift straight up 
on the cover to remove it. The battery is held in place by a 
spring contact. Gently lift this contact and turn the finder 
on its side. The battery should slip right out. Replace the 
battery with a 3-Volt CR2032 button cell battery. Slide 
the new battery under the contact, making sure that the 
positive terminal of the battery (the side marked with a “+”) 
is pointing upward, toward the spring contact. The battery 
should snap in place. Replace the cover by lining up the 
pins on the cover with the holes in the finderscope and 
pressing it down. Be sure to dispose of the old battery 
according to your local laws.

Battery
Compartment

CENTER THE TARGET  
IN THE EYEPIECE  

Look through the 

telescope using your lower powered eyepiece. Move 
the telescope until the object you chose lies in the 
center of the view. If the image is blurry, gently turn 
the focus knobs until it comes into sharp focus. 

LOOK THROUGH 
FINDERSCOPE

Once the object is centered in your 25 mm eyepiece, 
look through the finderscope and locate the red dot.

3

ADJUST THE FINDERSCOPE

Without moving the telescope,  use the two 
adjustment knobs to move the finder around until 
the red dot appears over the same object you are 
observing in the telescope’s 25 mm eyepiece.

YOUR FINDERSCOPE IS  
 NOW  ALIGNED!

It should not require realignment unless it is bumped  
or dropped.

4

The finder is one of the most important parts of your telescope. It helps you 
locate objects and center them in the eyepiece. The first time you assemble 
your telescope, you need to align the finder to the telescope’s main optics. 
It’s best to do this during the day*. 

*  SOLAR WARNING! 

Never attempt to view the Sun through any telescope without a proper 

solar filter!

CHOOSE A TARGET

Take the telescope outside during the day and find an 
easily recognizable object, like a streetlight, license 
plate or sign. The object should be as far away as 
possible, but at least a quarter mile away.

2

Low Power Eyepiece

Focus Knobs

1

5

ALIGNING THE

FINDERSCOPE