Questions tagged [eyepiece]

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7 votes
1 answer
424 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 ...
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  • 205
3 votes
1 answer
173 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 ...
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  • 205
6 votes
2 answers
188 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 ...
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  • 313
3 votes
0 answers
56 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 ...
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  • 313
3 votes
2 answers
160 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 ...
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1 vote
0 answers
80 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 ...
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3 votes
3 answers
365 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 ...
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2 votes
1 answer
472 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 ...
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  • 121
1 vote
0 answers
69 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-...
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2 votes
1 answer
71 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,...
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2 votes
1 answer
272 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 ...
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1 vote
1 answer
157 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.
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1 vote
1 answer
48 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 '...
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  • 185
6 votes
2 answers
704 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 ...
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