<p>I am currently using a Celestron Astromaster 130 EQ and I also have a similar type of caps.<br />
Starting from left to right, the first two are caps used to cover eyepiece holder in case the lens is not connected with it, and the last one is a cap for the lens. So I think they might have given you one extra cap as a lens holder.</p>

CC BY-SA 4.0
2020-07-17T17:41:58.777Z
2020-07-17T21:09:19.757Z
2020-07-17T21:09:19.757Z
Kaustubh Sen
<p>My son received a secondhand telescope for his birthday. It is a Celestron Powerseeker 114AZ.</p>
<p>I found these three black cap-like pieces separate from other parts. I can’t find what they are or what they do in the instruction manual.</p>
<p>What are they and what do they do?</p>
<p><a href="https://i.sstatic.net/u10SV.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/u10SVm.jpg" alt="Here’s a picture of them." /></a><br />
(click to enlarge)</p>

CC BY-SA 4.0
2020-07-17T14:01:15.630Z
If they have glass in them and you can see through them they are some type of lenses.  If the black stuff covers all of one side so you can't see through them they are lens caps.
M. A. Golding
CC BY-SA 4.0
2020-07-17T14:04:15.380Z
@M.A.Golding just black plastic. I initially guessed caps, but with three notches on the sides I didn’t know if they had anything to do with the spider vanes of the secondary mirror.
FrancisJohn
<telescope><newtonian-telescope>
What are these three black cap-like pieces?
FrancisJohn
# What are these three black cap-like pieces?

(Asked by: username_0 on 2020-07-17)

My son received a secondhand telescope for his birthday. It is a Celestron Powerseeker 114AZ.

I found these three black cap-like pieces separate from other parts. I can’t find what they are or what they do in the instruction manual.

What are they and what do they do?

[![Here’s a picture of them.](https://i.sstatic.net/u10SVm.jpg)](https://i.sstatic.net/u10SV.jpg)  
(click to enlarge)

**Tags:** telescope, newtonian-telescope

> **Comments:**
> **username_1**: If they have glass in them and you can see through them they are some type of lenses.  If the black stuff covers all of one side so you can't see through them they are lens caps.  
> **username_0**: @username_1 just black plastic. I initially guessed caps, but with three notches on the sides I didn’t know if they had anything to do with the spider vanes of the secondary mirror.  

---

## 1 answers

### Answer by username_2 on 2020-07-17. Score: 2 | Accepted answer

I am currently using a Celestron Astromaster 130 EQ and I also have a similar type of caps.  
Starting from left to right, the first two are caps used to cover eyepiece holder in case the lens is not connected with it, and the last one is a cap for the lens. So I think they might have given you one extra cap as a lens holder.


---

