Finding a Telescope for beginner

Have a scope to sell? Or wanna find a good deal? This is your place to buy, sell or trade astro stuff!
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KKK26
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Joined: Sun Jun 06, 2010 12:39 am
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Location: Woodlands

Post by KKK26 »

Hi Bros, which focal ratio is better, i.e f/6, f/8, f/10 for refractor telescope?
Thanks
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weixing
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Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster

Post by weixing »

Hi,
Slower focal ratio Refractor is usually easier to manufacture, so usually slower focal ratio Refractor telescope will perform better than a faster focal ratio Refractor telescope of the same class from the same manufacturer.

Have a nice day.
Yang Weixing
:mrgreen: "The universe is composed mainly of hydrogen and ignorance." :mrgreen:
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KKK26
Posts: 451
Joined: Sun Jun 06, 2010 12:39 am
Favourite scope: All nice scopes
Location: Woodlands

Post by KKK26 »

Hi Weixing,, thanks for help :)
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Chris
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Joined: Sun May 03, 2009 11:24 pm

Post by Chris »

Depends on your aperture. You wouldn't want to stretch the focal length of small aperture telescopes, that will affect your image quality. Also depends on what you wish to do with the scope. If you would want to consider astrophotography, a f6 scope will do. Larger focal ratio means longer focal length, and that will be frustrating especially if you don't have a tracking mount. Yes, lower f-ratio scopes are more costly, but there is no free lunch. Get something that will last instead of something that will end up in the second hand market real soon.
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KKK26
Posts: 451
Joined: Sun Jun 06, 2010 12:39 am
Favourite scope: All nice scopes
Location: Woodlands

Post by KKK26 »

Hi Chris, thanks for advice.
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