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Questions tagged [refractor-telescope]

Questions about telescopes with lenses as their main optical component.

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6
votes
3answers
1k views

Chromatic aberration in lens

Is there a way to prevent chromatic aberration without using an achromatic lens in refracting telescopes or in any other instruments...?
2
votes
1answer
102 views

Second Telescope: Maksutov Cassegrain vs Refractor

I bought my first telescope, a 3inch refractor a few weeks ago. It has been a wonderful experience seeing the Moon , Jupiter, Satrun magnified and Andromeda, M33, M81 and much more for the first time. ...
2
votes
1answer
97 views

Seeing a line rather than a dot when looking through refracting telescope

I bought an amateur(and rather cheap) refracting telescope and while I can see moon quite clear and crispy I am having difficulties in observing some larger stars. All stars appear as lines rather ...
3
votes
3answers
153 views

Advice on first Telescope (refractor vs reflector), Barlow lens

I am planning on buying my first telescope. I am getting an 80mm refractor and a 114mm reflector for the same price range. Which would be a better option? Further, would a Barlow lens solve the ...
2
votes
0answers
69 views

Can I couple (connect) a Reflector telescope and a refractor telescopes together?

I know it sounds crazy, but is it possible to connect a reflector telescope and a refractor telescopes (like monocular for bird watching) together to build a better telescope?
1
vote
1answer
361 views

Replacing Meade ETX with computerized mount

I've been using a Meade ETX 90 for a few years now. Since it doesn't have the new computerized mount (with goto), I am looking into buying one to swap out. Where might I find this and is there a more ...
2
votes
0answers
33 views

Equipment question

I'm looking to get some optical equipment that will be used for both terrestrial and astronomical viewing (ratio 70/30). It will also have to be portable to a degree although I realise that with a ...
1
vote
2answers
67 views

Stabilizers/dampers for refractor telescope

I have a basic refractor telescope. It's pretty light and so it catches vibrations and they never really settle down. Can I attach some dampers on it to cushion these?
5
votes
3answers
897 views

Question about Telescopes , observations and explanations of the observations

Though I am active on Physics, I am new to Astronomy. I am an amateur astronomer, actually even worse than amateur. I have just started it. I have a 60 mm objective 700mm focal length refractor which ...
3
votes
2answers
72 views

Capability of observing transits with terrestrial telescopes of various sizes?

I have access to my university's telescope, Dearborn Observatory, an 18.5 inch refractor on the shore of Lake Michigan, just north of Chicago (yes, it's an atrocious location, but the telescope still ...
3
votes
2answers
19k views

How to make a telescope for viewing planets, moon and DSOs using a convex lens of aperture 100 mm and focal length 200 mm and other lenses at home?

I wanted to make a telescope with DIY things lying around in home. I read up that the aperture was a very important aspect and thus bought a convex lens with 100mm aperture and 200mm focal length, to ...
3
votes
3answers
1k views

Astronomical telescope making

I am thinking about making a telescope. I have a 100cm focal length lens which I can use as objective lens in my telescope. So which is the best focal length I can use as eyepiece in my astronomical ...
6
votes
1answer
3k views

Are Barlow lenses stackable for bright objects?

I'm back to the refractor that I own, and I want to maximize the zoom capacity. I realized today that I own more than one barlow lens, and I was wondering if I could stack them together for looking at ...
11
votes
1answer
122 views

Does the Reflection Method for Looking at the Sun Work For Refractors?

I own a newtonian reflector and occasionally use it (using the reflection method with paper) for looking at the sun. I happen to also own a refractor, but I'm not exactly sure if the reflection method ...
13
votes
1answer
1k views

How Does a Refractor Telescope Work?

As I understand it, the difference between a reflector and a refractor is that a reflector uses mirrors on the back to reflect the light to the secondary mirror then the secondary mirror reflects the ...