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iverp
sage


Reged: 04/16/10

Visual back threads - Why? new
      #5789808 - 04/10/13 09:01 AM Attachment (34 downloads)

I have been had a Meade SCT for several years now, but have never figured out why the standard SCT visual back is threaded on eyepiece end. Obviously the collar that attaches it to the SCT port is threaded, but what fits the other threads? I'm attaching a small pic with the threads I mean arrowed, just so everyone understands the ones I'm referring to.

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orion61

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Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: Visual back threads - Why? new [Re: iverp]
      #5789922 - 04/10/13 10:15 AM

I believe there used to be an F5 Focal reducer that screwed onto it so no loss of the light cone..
Also certain camera equipment will screw onto it..
mainly for photography.
I have/had a really old Accy catalog that showed some of these accys. Then Celestron came out with the GREAT Japanese made F6.3 FR/FF.. Still the best.. I have had them all.
If you are in the market for one try to get the MIJ one.
I find the Stellar images to be more pleasing, color and
sharpness.


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Brian Risley
Carpal Tunnel
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Reged: 09/04/06

Loc: SW Florida
Re: Visual back threads - Why? new [Re: orion61]
      #5792980 - 04/11/13 06:07 PM

Tele-extender threaded on (about 6" long). Allowed an eyepiece to be placed in the holder (provided it wasn't to large, the old ones weren't) and then a camera T-ring went on the end.
This was the old standard for film planetary and lunar photography.
Brian


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Christopher EricksonModerator
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Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Visual back threads - Why? [Re: iverp]
      #5793690 - 04/12/13 01:27 AM

Quote:

I have been had a Meade SCT for several years now, but have never figured out why the standard SCT visual back is threaded on eyepiece end. Obviously the collar that attaches it to the SCT port is threaded, but what fits the other threads? I'm attaching a small pic with the threads I mean arrowed, just so everyone understands the ones I'm referring to.




Those are standard T-threads.

http://en.wikipedia.org/wiki/T-mount

Very common with telescopes and camera adapters.


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Matthew Ota
Hmmm


Reged: 04/30/05

Loc: Los Angeles, California
Re: Visual back threads - Why? new [Re: Christopher Erickson]
      #5797116 - 04/13/13 04:52 PM

That thread where the arrow is pointed is also used for Meade's older 2 inch star diagonal, which screwed onto the adapter.

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Hamsterdam
super member
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Reged: 03/23/11

Loc: smack dab in the middle of the...
Re: Visual back threads - Why? new [Re: Matthew Ota]
      #5809099 - 04/19/13 05:08 PM

Yes, My LX200 10" f/6 has a diagonal with a collar-type nut that screws onto the visual back of my scope. It has been awhile, so I do not recall if my JMI focuser attaches the same way. I do know that before I was aware a field flattener was of no use with my f/6, the threads on it do not match the visual back. It is almost like Standard vs SAE, in the bolt world. Anybody looking for a Meade f/6.3 flattener?

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