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Does this diagonal belong on a hi-tech Ritchey?

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#1 ccaissie

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Posted 13 February 2018 - 03:02 PM

This piece came to our club with a 14" Meade LX200 SCT.  It doesn't fit anything we have...It may have been associated with a 14" Ritchey -Cretien used as an upgrade from the Meade for astrophotography.

 

The straight tube measures 2.010" i.d. and 2.500" o.d with two clamping screws.  The mirror itself is adjustable with 3 tiny setscrews.

The other end has a swivelling female thread piece, about 50mm in diameter.

 

What is it?  

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#2 Richard Whalen

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Posted 13 February 2018 - 03:15 PM

Don't know why anyone would use a diagonal in a RC unless they were using it for visual use?


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#3 junomike

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Posted 13 February 2018 - 03:39 PM

It's an old C14 Diagonal (see this Ad).



#4 photoracer18

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Posted 13 February 2018 - 03:58 PM

Ditto. First generation C14 2" diagonal. Normally screws onto the big port at the visual back opening although I think it could do a 2" also with an adapter.

#5 Peter Besenbruch

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Posted 13 February 2018 - 04:24 PM

It's an old C14 Diagonal (see this Ad).

Celestron also sold a version of it for the C8. I used to own one. The thing weighed a ton.



#6 ccaissie

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Posted 14 February 2018 - 02:53 PM

Don't know why anyone would use a diagonal in a RC unless they were using it for visual use?

Right.  It makes sense that it was a C14.  The original owner was trying all sorts of combos to get some astrophotos...wound up with a Ritchey.

 

Thanks.

 

So Is it worth putting on the market as is, or is the mirror inside worth salvaging..someone said it was high quality...



#7 davidmcgo

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Posted 18 February 2018 - 10:39 AM

The diagonal pictured is actually the C8 version.  The front ring threads on to the 2" treads on the rear cell.  Way too heavy and too much back focus to use on my C8 and even to big for my 1965 C10 practically.

 

The C14 version had a longer nose and female 3.25" threads.

 

The output side of the diagonal actually has the larger 3.25" threads that the C11 and C14 use.  So you can unscrew the 2" eyepiece adapter and put that on the rear of a C11 or C14 as a straight through 2" back.

 

Dave




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