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Celestron C90 Registry

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102 replies to this topic

#101 Masvingo

Masvingo

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Posted 29 March 2020 - 02:37 PM

Hi all!

I read somewhere that the C90 telephoto lenses are black and either 500mm or 1000mm focal length. Anyone know if this is correct?

I think that generally the telephoto versions were black although there are a couple of early ones on the registry that are orange. 

 

The first telephoto was essentially the same OTA as the spotter and astro and had the same specs being f/11 with a focal length of 1,000mm.  A finderscope was added to make the spotter version and a single arm fork mount was added to the spotter to make the astro version.

 

Later on in production, there was also a f/5.6 version with a 500mm focal length.  There are 4 f/5.6 versions on the Registry, all have a black OTA.



#102 houndsbourgh

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Posted 29 March 2020 - 03:41 PM

Thanks houndsbourgh, I've updated the entry for #919048.  I note your other C90 serial number is quite close, did you specifically look for one with a similar number or was it just chance?
 

I just like that particular incarnation of the C90. Seems the ribbed focuser on a gold band in black was short lived.


Edited by houndsbourgh, 29 March 2020 - 03:44 PM.

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#103 ANM

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Posted 01 April 2020 - 03:56 PM

hI all,

I recently acquired an orange C90 telescope OTA s/n 902563 and I'd like to get it added to the registry if possible. There is a number etched into the edge of the corrector but all I can see is two digits, either 18 or 81 depending on whether I stand on my head or not. I've attached a photo of it here:

 

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