Questions tagged [eyepiece]
The eyepiece tag has no usage guidance.
17
questions
1
vote
1
answer
97
views
Why does the sun appear on the screen behind an eyepiece when doing solar projection?
I've seen Youtube videos explaining how to "safely" observe the sun by projecting an image of the sun onto a piece of cardboard behind the eyepiece of a refracting telescope or binoculars. ...
- 275
1
vote
0
answers
50
views
How do eyepiece mm values equate to telescope tube extension mm values?
I'm trying out a DSLR on my Celestron 70EQ refractor telescope with a DSLR T-ring.
The first try didn't magnify very much, and I learned that I need to extend the focus length to magnify the image; I'...
- 241
4
votes
0
answers
196
views
Is my TAL-1 telescope too old to be useful
I have a TAL-1 4.3” Newtonian reflector. It is old, gifted to me by my dad and was gifted to him many years ago.
Last year I spent some time cleaning it, calibrating and getting it in a good state. It ...
- 41
7
votes
1
answer
865
views
Will a 10mm eyepiece with a barlow 2x produce the same result as a 5mm eyepiece?
So I have been wondering if a barlow (say 2x) will produce the same result of a half eyepiece....
So would a 10mm with a 2X Barlow produce the same result as a 5mm? (Assuming the FOV is the same on ...
- 215
3
votes
1
answer
344
views
Using a 2" filter on the 1.25" adapter
I recently got a new 10" telescope which comes with a 2" to 1.25" reductor (something like whats seen here)
I have 2" and 1.25" eypiece, and want to buy a UHC filter, so my ...
- 215
6
votes
2
answers
622
views
How do you clean a foggy or dirty eyepiece of a telescope?
I'm wondering what the procedure would be to clean the eyepiece of a telescope when it looks foggy or there's dirt either on the outside or inside it.
I can get rid of loose dirt with a camel hair ...
- 343
4
votes
0
answers
119
views
Telescope's eyepieces got blurry over time [closed]
Right at the beginning: This is not a duplicate of questions involving blurry images through their eyepieces. I only get blurry images for 2 of my 3 eyepieces so it's not the telescope's fault and in ...
- 343
3
votes
2
answers
1k
views
Focus Problems when using Barlow 3x or 4mm lens
So I just recently bought a Celestron Powerseeker 127EQ 12.7 cm f/7.87 Cassegrain telescope and I inserted a 20mm eyepiece and the telescope with the Moon.
That eyepiece seems to work fine, but when I ...
1
vote
0
answers
400
views
Why does my 10mm eyepiece produce blurry images?
I own a tabletop Sky-Watcher Heritage 130mm tabletop Dobsonian with a f/5 130mm aperture and 630mm focal length. 25mm wide-field eyepiece and a 10mm narrow-angle eyepiece. Last night I took it out to ...
- 6,613
4
votes
3
answers
918
views
How to choose eyepieces and other accessories for a Celestron 70mm f/5.7 portable refractor?
I have a Celestron Specialty Series Travel Scope 70mm refractor which came with 10mm (40x) and 20mm (20x) eyepieces.
Specifications:
Focal ratio: f/5.71
Optical Design: Refractor
Aperture (mm): 70 mm
...
- 41
2
votes
1
answer
3k
views
Camera adaptor won't focus [duplicate]
I'm trying to use my DSLR camera (Canon EOS-40D) with my kids' Celestron First Scope.
I bought a 3x Celestron 1.25" barlow, Celestron 1.25" T-adaptor, and the Canon ring. These things all ...
- 121
1
vote
0
answers
167
views
How to choose the right Barlow lens?
I have a OneSky AWB 130 (130 mm aperture) Newtonian telescope w/ 650 mm aperture.
I previously asked a question on another account on what lens to get next--@AaronF suggested that I get the Orion Tri-...
2
votes
1
answer
132
views
Next eyepiece for my telescope; how do decide which one to get?
I have an Astronomers Without Borders telescope with 650 mm focal length and 130 mm aperture. To go with them, I have a 10 mm and wide eye relief 25 mm eyepiece.
I tried to view Jupiter with the 10 mm,...
2
votes
1
answer
832
views
How does eyepiece exit pupil diameter affect image clarity and viewing experience?
This answer to Not Able to View Objects with Barlow Lens includes a calculation of exit pupil diameter as a way to address the limits of useful magnification when observing planets with a small ...
- 31.3k
1
vote
1
answer
2k
views
Choosing an eyepiece for planet viewing
I have a Celestron Astromaster 130EQ which came with a 10mm and 20mm lens. I can not see mars, Jupiter, or Saturn as expected, I only see white dots. What lens should I buy to view these planets.
- 11
1
vote
1
answer
61
views
Meade 4000 'LP' designation
I have a Meade 4000 super Plossl 26mm eyepiece in front of me with an 'LP' mark on it. I am a fan of the Meade 4000 series, but this is the first time I see this variant.
It looks like it stands for '...
- 185
6
votes
2
answers
2k
views
Would alcohol wiping damage multi-coated eyepiece coating? How else can I take COVID precautions on the eyepiece?
My small group of friends will be wearing masks. But could COVID-19 be spread by eyes/eyelashes touching the eyepiece? If so, what precautions should I take?
I have a small Starblast scope with an ...
- 91