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Forum » SpaceEngine » Off-topic Discussions » Telescopes
Telescopes
MosfetDate: Monday, 27.06.2016, 13:40 | Message # 16
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I have a very old reflecting telescope, and I haven't used in years because the reflecting surface is ruined. It happens on those mirrors after many years, depending also by which materials were used for the coating and the overall price of the telescope, I'd say.
Anyway, what is the best telescope for you? Well, it depends on what are you interested.

As I recall, Refractors are composed by groups of main lenses and correctors into the (usually long) body of the telescope, that focuses the light into a terminal prism and some interchangeable objectives on the base.

Reflectors instead use curved mirrors as well as lenses to collect and focus the light. Usually they're much larger than the other type, typically because it's easier to build a very good mirror than a very good lens. A reflector can also have a more compact body, like the Celestron 114, or Celestron C8, in which the light is routed in differently positioned terminal prisms or secondary mirrors, in order to extend the total length of the light.

Refractors give their best on luminous objects like planets and stars, Reflectors usually are able to collect more light and are suited for deep-sky objects like nebulae, star clusters, galaxies, everything very faint to the naked eye.

Obviously there's not a boundary, you can enjoy planets with both types of telescopes. Personally I had experience with reflectors only, even in local little observatories owned by astronomy enthusiasts or students.

There are many nignts I enjoyed watching the skies. Probably the most beautiful moments I'll remember forever are my "first times": First time I pointed at the Moon I literally stepped back from the oculars, a little intimidated. The same night after a while I pointed to a very luminous star near the Moon, to immediately discover Jupiter, its bands and Medicean satellites.
First and only time I've found Halley's comet in 1986, very dim and a bit "fluffy".
First time I pointed at Albireo, I still can see those wonderful colors when I close my eyes.

The fact is: We are living in a moment in time when technology and science gave us incredible images of our solar system and outer space, we landed even on Titan, enjoying detailed images of galaxy core... and yet watching directly "fluffy" objects or very dim nebulae like M57 that I could only perceive, with your own instrument, for me it's the best.





"Time is illusion. Lunchtime doubly so."
Douglas N. Adams
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Edited by Mosfet - Monday, 27.06.2016, 17:28
 
spacerDate: Monday, 27.06.2016, 13:49 | Message # 17
Star Engineer
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Israel
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Mosfet, thank you very much!
i will do some research and maybe i will be able to try both before buying and decide what better for me!





"we began as wanderers, and we are wanderers still"
-carl sagan

-space engine photographer
 
spacerDate: Monday, 27.06.2016, 19:36 | Message # 18
Star Engineer
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Israel
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mostef, 1 more question. if i buy a telescope that doesnt have sun filter, can i still watch distance stars?
or its still very dangerous?





"we began as wanderers, and we are wanderers still"
-carl sagan

-space engine photographer
 
MosfetDate: Monday, 27.06.2016, 20:04 | Message # 19
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The sun filter is mounted on oculars whenever you want to see the Sun's photosphere, dark spots to be precise, otherwise is removed for other observations. You could always buy it later.
Distant stars will always be only a bright point, no need for filters.
It could be useful a moon filter, to filter a bit Moon's extreme brightness during some days around full moon, otherwise it's not really necessary.
Eventually you could buy later also additional parts, other oculars, etc.





"Time is illusion. Lunchtime doubly so."
Douglas N. Adams
My mods
Asus x555ub: cpu i5-6200u - ram 4gb - gpu nvidia geforce 940m 2gb vram
 
spacerDate: Monday, 27.06.2016, 20:17 | Message # 20
Star Engineer
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Israel
Messages: 1257
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Mosfet, ok thanks mosfet!




"we began as wanderers, and we are wanderers still"
-carl sagan

-space engine photographer
 
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