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Older C8 OTA input - Strabright vs Special Coatings ?

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#1 vkhastro1

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Posted 09 September 2021 - 11:37 AM

I have (unfortunately) over time acquired several Celestron C8 fork mounts of various types.

Also various Celestron C8 wedges and tripods.

A Tuthill polar alignment scope, digital encoders, etc also not being utilized.

All are siting in my basements not being used.

 

I already own a great optically orange Celestron C8 SE (Strabright XLT) OTA that I use alt-az mounted.

Unfortunately the current hole pattern of this specific OTA will not fit any of the fore-mentioned C8 fork mounts.

 

I may look for a black C8 OTA with “starbright” or a black or orange OTA with “special coatings” to mount into one of these fork mounts. I believe the “Starbright” coatings has higher light transmission than the “special coatings” version. Any guidance on this point?

 

You may ask - Why would I want another C8?

My first “real” telescope was a 1981 orange C8 that I used for almost 8 years (many fond memories).

Also I prefer equatorial mounted fork mounts to German style mounts.

Let me know your thoughts on this (I have a large arsenal of other scopes so this will not be a primary scope).


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#2 barbarosa

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Posted 09 September 2021 - 11:56 AM

https://www.celestro...ptical-coatings

 

https://www.cloudyni...s/#entry9008879

 

Upon reflection this is a good, better, best situation but how do you balance that against the other optical qualities? I do think though that there are few, if any, threads from owners saying that they perceived the improvement in transmission when they changed to a scope with a newer generation of coatings.


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#3 Old Speckled Hen

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Posted 09 September 2021 - 02:04 PM

This site has a GREAT deal of archive information on this very subject.


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#4 Phil Barker

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Posted 11 September 2021 - 05:29 PM

Interesting.  I found the meade emc coatings were better than standard starbright.  I owned 2 excellent scts both f10 one emc the other starbright.   Meade was noticeably better darker background and better colours etc.

 

I now own a uhtc version don't see it beng any better than the emc which clearly are not the standard coatings.

 

Re special costings the old club had a superb c11 with special coatings from around 1982 vintage and orange.  I had a starbright coated   C11 around 2000 with reasonable optics.

 

The special coatings were clearly anti reflection coatings on the corrector.  It was slightly dimmer than the starbright  version but had better  optics.  The detail on jupiter in this scope was incredable via the excellent correction.   

 

At the time the club had a mediocre 12 inch meade and they wanted to put that in its own observatory  I made a strong  point to the powers that be that the Celestron was far more worthy given its optics not sure it it happenned as I moved over to Hokitika around this time.




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