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Quality diagonals

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#1 Bonco

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Posted 19 June 2007 - 11:06 PM

For my 3 inch Unitron I need one of two things and seek members help. The .965 to 1 1/4 diagonal I bought for around $30 from a popular supplier doesn't cut it. The tube that goes into the draw tube is only 3/4 inch so there is lots of play affecting collimation. To make it usable I have an ugly hose clamp around it but its still hard to keep it square. Also the prism body is plastic.
I need to find a quality .965 to 1/1/4 diaqonal or better yet find a 1 /1/4 screw in adapter for the draw tube so that any standard 1 1/4 diagonl can be used. Please let me know if you have any suggestions.
Thanks, Bonco

#2 twhite

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Posted 19 June 2007 - 11:28 PM

You can still get 1.25" draw tube adapters from Unitron -- we had some discussion about that here just a few weeks ago... Unitron 1.25" adapter

#3 Bonco

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Posted 20 June 2007 - 08:24 PM

Thanks Tony I'll give Unitron a call.
Bonco

#4 Bonco

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Posted 21 June 2007 - 08:48 PM

Called Peter Indrigo at Unitron today. Yes they have the 1 and 1/4 inch screw in adapter. He's sending one to me for $30 plus shipping. Seems there may be a slight thread difference on various models and teflon tape might be needed to to be wrapped on the threads. Won't know until I try it. Either way I think it will work just fine. Now I need to find a quality 1 /14 diagonal. Thanks for the tip about contacting Peter. They have a few other vintage parts but he didn't specify what was left in inventory. Bonco

#5 Bonco

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Posted 27 June 2007 - 10:56 PM

For $30 Unitron sent me a 1 1/4 inch adapter. Screws into the draw tube perfectly square. I've ordered a quality 1 and 1/4 diagonal from Stellarvue. Me thinks this will be a big improvement over the cheapie .965 to 1 1/4 diagonal that I've been using. Bonco :)
Bonco


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