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Diagonal with a collar?

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#1 vvalmiki

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Posted 14 February 2020 - 04:50 PM

I think this is vintage enuff to post here.

 

2" diagonal with collar (the collar is threaded), what is this for?

 

One is 2" id the other is 1.5"id, the 1.5" end is threaded/baffled.

 

I have no use for but was curious what this is for.

 

Circle W

 

Regards, Vinay

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#2 Russell Smith

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Posted 14 February 2020 - 04:55 PM

SCT?
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#3 vvalmiki

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Posted 14 February 2020 - 04:55 PM

is it for a camera?



#4 vvalmiki

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Posted 14 February 2020 - 04:57 PM

closest I came to was this

 

 

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#5 TOMDEY

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Posted 14 February 2020 - 05:15 PM

Yeah, it's similar to this Celestron Star Diagonal that I characterized a while back. That one could be used either way, directly attach to SCT threaded back end, or into a regular 2-inch focuser, using the attachment shown there.    Tom

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#6 photoracer18

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Posted 14 February 2020 - 05:17 PM

Its to screw it directly onto the visual back threads on the rear of an SCT. It reduces the back focus from using some other solutions. Celestron sells one that has both the SCT and the regular 2" barrel with that part being interchangeable. And it has the brass compression ring. I think GSO or Antares sells one like that also.


Edited by photoracer18, 14 February 2020 - 05:17 PM.

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#7 Russell Smith

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Posted 14 February 2020 - 08:09 PM

Looks a lot like the diaginal on a meade 2045. Not meade but it looks like it.
I'll fess up to not knowing much. Did parks offer any compound scopes?

Circle W is also a bit of a who made it thing.


Edited by Russell Smith, 14 February 2020 - 08:10 PM.

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#8 G-Tower

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Posted 15 February 2020 - 12:27 AM

Its to screw it directly onto the visual back threads on the rear of an SCT. It reduces the back focus from using some other solutions. Celestron sells one that has both the SCT and the regular 2" barrel with that part being interchangeable. And it has the brass compression ring. I think GSO or Antares sells one like that also.

exactly




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