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2" eyepieces on orion skyview 127 mak .. How

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#1 Guest_**DONOTDELETE**_*

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Posted 24 October 2005 - 04:28 PM

i have a 120 orion skyview refractor with a 2" televue diagonal and a 127 orion skyview mak , please tell me what i need to use 2" eyepieces on the maksutov 127 orion skyview.What i need to buy ?

#2 BluewaterObserva

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Posted 24 October 2005 - 04:43 PM

I believe on the MAK a 2" doesn't buy you anything, the hole through the primary is small. Somebody else correct me if I am wrong please.

#3 Scott Beith

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Posted 24 October 2005 - 05:12 PM

The interior tube is only 27mm. A widefield 1 1/4" EP will be your best bet. I owned an Orion Starmax 127 and a simple 32mm plossl was my favorite EP with that scope.

#4 Gaz O'C

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Posted 24 October 2005 - 06:00 PM

I believe on the MAK a 2" doesn't buy you anything, the hole through the primary is small. Somebody else correct me if I am wrong please.


You are not! :)

#5 Starman1

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Posted 25 October 2005 - 01:05 AM

Yup, no point to make this a 2" visual back. The opening in the primary baffle is too small.
The widest field of view will be with any 1-1/4" eyepiece with a 27mm field stop, like a 32mm Plossl, 24 Panoptic, 35mm Ultrascopic/Parks Gold Series/Antares Elite, etc.
The max field of view is just a trace over 1 degree.

#6 Rat8bug

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Posted 25 October 2005 - 07:27 AM

Here's what I have (would) do. My Apex 127mm maksutov was converted to take SCT thread ( 2"- 24 tpi) accessories. I did this by using a 36.4mm LAR (large Accessory Ring), that is no longer available from Celestron. The LAR is a male-male threaded device, that has a 36.4mm thread on one end, and a SCT thread on the other. I did this because it gives more versatility to use my SCT accessories and my Nikon D70 DSLR. AFAIK, the LAR will have to be custom made. The OE eyepiece adapter is removed, and in its place is screwed the LAR. With this change, I can use my JMI NGF-C 2" crayford focuser, TV 4x 2" Powermate, Celestron .63 focal reducer, etc. I don't have any 2" EPs and don't intend to get any. I find the TV Panoptics to work just find for my uses.

http://www.barrie-tao.com/apex127.html

Ciao...Barry

#7 Festus

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Posted 25 October 2005 - 02:16 PM

My Apex 127mm maksutov was converted to take SCT thread ( 2"- 24 tpi) accessories. I did this by using a 36.4mm LAR (large Accessory Ring), that is no longer available from Celestron.


I had one machined from a local machine shop ~$80 canadian. I can now use my Meade microfocuser and other bits and pieces on the 127. However for visual - as already stated- it does nothing as the connection size is still limited.

#8 TK6411

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Posted 25 October 2005 - 02:40 PM

Scorpionn,

Check out scopetronix.com they currently sell what you are looking for: STLAR $24.99 its their Large Accessory Ring for Mak/Cass scopes and will fit your Apex. It will allow you to use standard SCT accessories such as T-Adapters, 2" diagonals, visual backs, etc. to the rear port of your scope.

Jim

#9 Rat8bug

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Posted 25 October 2005 - 05:28 PM

Scorpionn,

Check out scopetronix.com they currently sell what you are looking for: STLAR $24.99 its their Large Accessory Ring for Mak/Cass scopes and will fit your Apex. It will allow you to use standard SCT accessories such as T-Adapters, 2" diagonals, visual backs, etc. to the rear port of your scope.

Jim


FWIW, the LAR carried by Scopetronix is designed for ETX telescopes. These items do not have a 36.4mm male thead, thus will not fit the Apex/Orion/Skywatcher 127mm mak's.

Ciao...Barry

#10 TK6411

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Posted 25 October 2005 - 10:31 PM

I think Barry may be right on the thread size for the LAR...it may not be compatable.

Jim

#11 southmike

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Posted 25 October 2005 - 11:58 PM

no but someone used to make an orion to sct thread adapter

#12 Rat8bug

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Posted 26 October 2005 - 07:35 AM

no but someone used to make an orion to sct thread adapter


Orion used to sell them, but stopped. It was a Celestron part called the 36.4mm LAR. Celestron stopped making them available. So the only way I know to get one is custom made. If you have a lathe and know how to cut threads, it's a fairly easy 1 to 2 hr project. I would start with a piece of 6061-T6 aluminum stock (2.0" dia x 1.25" length). Face off to a total length of 26mm. Bore a 33.5mm i.d. hole straight through. Cut an external 2" - 24 tpi thread a length of 10mm on one end. Cut a 36.4mm x .75 pitch external thread, 10mm long on the other end. Done.

Ciao...Barry


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