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 Post subject: Celestron C4-R Telescope
PostPosted: Tue Mar 20, 2012 5:03 pm 
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Location: Horwich
Hi all

Has anyone had any experence of a Celestron C4-R Refactor, looks like it's a few years old and not sure if the lense being multi coated is any good

Basic spec
Aperture 102mm
Focal lenght 1000mm
Focal ration 9.8
Mount CG-4 Equatorial

Thanks

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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Tue Mar 20, 2012 5:20 pm 
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Bill,
Don't know much about it but it looks like a big telescope on a small mount. This is usually a recipe for frustration! The mount is often where manufacturers make economies but in use a good one makes all the difference. Unlesss it is very cheap I would probably look elsewhere.


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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Tue Mar 20, 2012 5:50 pm 
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It does look a bit unstable, but having no experence I thought it was worth posting, as you say at the right price might be ok

Thanks

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Opticstar PX-35C COOLAIR CCD camera


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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Wed Mar 21, 2012 6:51 am 
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I think that the CG-4 mount is equivalent to the EQ3-2, which is used with many 6" Newtonians ,and has provision for a polar-scope and motor-drive - see the recent thread from Andy Martin: http://www.boltonastro.org.uk/forums/viewtopic.php?f=8&t=236


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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Wed Mar 21, 2012 10:09 am 
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Did not get much chance to speak last night

Sound OK then,
He is asking £200 for the Scope and Mount only been used a few times, I'm presumning as it's a coated lens it's not a achromatic refractor lens

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SkyWatcher HEQ5
Sky-Scan EQ3-2
Celestron C8
SkyWatcher 80ED Apro
Sky-Watcher Skymax-127 SynScan AZ GOTO
Canon 600D
Canon 400D
Opticstar PX-35C COOLAIR CCD camera


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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Wed Mar 21, 2012 3:10 pm 
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bbones wrote:
He is asking £200 for the Scope and Mount only been used a few times, I'm presuming as it's a coated lens it's not a achromatic refractor lens


I expect that it will be an air-spaced doublet, i.e. an achromat (not APOchromat!).
Check if there are motor-drives on the mount - if there are it may be worth buying the package for the motorised CG4 and then trading in the 'scope tube after you've had a play with it.
I once bought an 8" Newtonian on a motorised EQ5, and then kept the same mount for a SkyWatcher 4" refractor and then my C8 SCT.


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 Post subject: Re: Celestron C4-R Telescope
PostPosted: Wed Mar 21, 2012 3:38 pm 
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Hi

Thanks for the reply. Not fitted with a motor and would cost too much to add one.

From what i'm finding out it looks like I will end up getting one for portablity and one for use at home or local viewing, so it looks like the Sky-Watcher Skymax-102 SynScan AZ GOTO for the caravan and Sky-Watcher Explorer-150PDS on a EQ3 or if I can push the boat out a EQ5

There me thinking just go out and buy a scope...... :lol:

I will get there

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Sky-Scan EQ3-2
Celestron C8
SkyWatcher 80ED Apro
Sky-Watcher Skymax-127 SynScan AZ GOTO
Canon 600D
Canon 400D
Opticstar PX-35C COOLAIR CCD camera


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