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Vixen VC200L imaging gear help

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#1 MakNewtMan

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Posted 30 November 2019 - 09:06 PM

Looking for help from people that have setup an imaging train for the Vixen VC200L and a APS-C digital SLR.  I have the focal reducer and the Celestron Off axis guider.  It appears I need some kind of reducers/adapter to get everything to fit right.  The VC200L has internal threads on the scope and so does the SCT adapter piece that comes with the celestron OAG and so I cannot connect it to the scope. What adapter do I need?   Also, the .71 reducer I have does not screw directly into the scope either.  I need to know which adapter(s) I need to connect both the reducer and the OAG to the telescope and my DSLR. I also plan on using my QHY 183C with the Celestron OAG and reducer as well.   Thanks for the help



#2 OldManSky

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Posted 30 November 2019 - 09:57 PM

I had one years ago, and used it with a DSLR and a StarlightXpress camera...

If I remember correctly, I had to use this reducer:

 

https://www.vixenopt...00L-p/37229.htm

 

...and both an extension tube and the Camera Adapter 43 from Vixen.

 

It's nearly as complicated as hooking things up to a Takahashi...smile.gif

 

I'd contact Vixen USA if I were you, and ask them to help you figure it out.  There's a "Contact Us" link at the bottom of the page above.

 

Edit: I found the VC200L "system chart" showing how to hook up a DSLR, but it doesn't include an OAG and it's about as clear as mud....but maybe it will help:

 

http://vixenoptics.c...00L_VMC200L.pdf

 

Scroll down to page 3.


Edited by OldManSky, 30 November 2019 - 10:01 PM.

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#3 rk2k2

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Posted 30 November 2019 - 09:58 PM

If your reducer doesn't screw directly onto the scope, you have the wrong reducer,  The correct reducer has the 60mm threads that thread into the draw tube (M).  The other side has the same 60mm mating threads (F) as the draw tube.

 

Vixen also sells ($64.95) a 'Common Photo Adapter', a '4/3 Photo Adapter' and a 'Canon Photo Adapter'.  Those account accordingly to the sensor to flange distance of the specific camera.  Those adapters screw directly to the reducer and the other side you attach your T-ring adapter for your camera.  For $200+ you can also buy the Vixen Photo Adapter for Canon or Nikon that has the T-ring attached  I don't know exactly what makes those so special.

 

As for the OAG, I haven't investigated that but off the top of my head I don't think there is a solution for fitting in the 20 mm spacing when using the Photo Adapter and an APS-C camera.  I seem to recall someone having an appropriate adapter made (60mm-M to 48mm?).  Also seems to me there should be an off the shelf adapter like that.  That eliminates the Photo Adapter and provides more space to work with,


Edited by rk2k2, 30 November 2019 - 10:20 PM.


#4 bjulihn

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Posted 30 November 2019 - 10:01 PM

Hey There;

 

I want to suggest an article that took some of the mystery out of various astronomy threads and connectors for me. Here's the link.

 

https://agenaastro.c...-explained.html

 

It is not specific to your setup but might be helpful in identifying various threads and the type of connectors you will need. It might also help you converse knowledgably with others.

 

Brad


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#5 rk2k2

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Posted 30 November 2019 - 11:21 PM

Looking for help from people that have setup an imaging train for the Vixen VC200L and a APS-C digital SLR.  I have the focal reducer and the Celestron Off axis guider.  It appears I need some kind of reducers/adapter to get everything to fit right.  The VC200L has internal threads on the scope and so does the SCT adapter piece that comes with the celestron OAG and so I cannot connect it to the scope. What adapter do I need?   Also, the .71 reducer I have does not screw directly into the scope either.  I need to know which adapter(s) I need to connect both the reducer and the OAG to the telescope and my DSLR. I also plan on using my QHY 183C with the Celestron OAG and reducer as well.   Thanks for the help

I just looked up Celestron OAG  Is this what you have?

 

https://www.amazon.c...ASIN=B00DSXW5OU

 

I eventually may try OAG so 'd be interested in finding out what you do.

 

 

The pic on Amazon for the OAG LOOKS like it has the adapter attached- they also sell the adapter which looks to me to be in the pic just for the OAG  Which leads me to think part of the OAG as shown by Amazon comes off?  Revealing 60mm- F threads?

 

EDIT:  I don't believe it smile.gif   Someone said in another thread  on CN that it has M48 threads

END EDIT

 

 If so, just screw the OAG onto the VC200, then screw the reducer (I assume you DON'T have the correct reducer) onto the OAG.  From that point, connect the Vixen Photo adapter with attached T-ring and then your DSLR.  (you can attach your camera by other means than the Vixen Photo Adapters, they just make it easier).

 

No clue what effect that may have on focusing  to infinity?


Edited by rk2k2, 30 November 2019 - 11:39 PM.


#6 Simon B

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Posted 01 December 2019 - 12:15 AM

Which reducer do you have?

 

The newer reducers: https://www.vixenopt...00L-p/37229.htm  or  https://www.vixenoptics.com/Vixen-Reducer-HD-for-VC200L-p/37247.htm

have M60x0.75 male threads on the focuser side, and M60x0.75 female threads on the camera side.

 

The older reducers: https://global.vixen...roduct/37229_4/  or  https://www.astroshop.eu/flatteners-correctors-reducers/vixen-focal-reducer-vc200l/p,5916

have no threads on the focuser side, and M55x0.75 male threads on the camera side.

The older ones are supposed to thread into a Vixen proprietary adapter such as the 'wide photo adapter', which has M60x0.75 male threads on the focuser side, and internally it will have M55x0.75 female threads, to attach the reducer.

 

 

It's a bit complicated - if you have one of the newer ones, you need to get an adapter that has M60x0.75 male threads on one side, and whatever threads onto the OAG on the other side.

 

If you have one of the older ones, the only way I can think of that would work is to buy a couple of Borg adapters. The Borg 7901 (which has the required internal M55x0.75 female threads that accommodate the older reducers), and then the Borg 7522 which (I think!) will thread onto the 7901 on one side, and the other side will have male T-threads (M42x0.75) to connect to the OAG, assuming your OAG has female T-threads

 

 

 

EDIT: actually that would put the OAG between the reducer and the camera... depending on how much light path the OAG takes up, might need to put the reducer between the OAG and the camera instead.... not sure what the correct distance should be between the reducer and the sensor.


Edited by Simon B, 01 December 2019 - 01:36 AM.


#7 MakNewtMan

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Posted 01 December 2019 - 12:48 AM

If your reducer doesn't screw directly onto the scope, you have the wrong reducer, The correct reducer has the 60mm threads that thread into the draw tube (M). The other side has the same 60mm mating threads (F) as the draw tube.

Vixen also sells ($64.95) a 'Common Photo Adapter', a '4/3 Photo Adapter' and a 'Canon Photo Adapter'. Those account accordingly to the sensor to flange distance of the specific camera. Those adapters screw directly to the reducer and the other side you attach your T-ring adapter for your camera. For $200+ you can also buy the Vixen Photo Adapter for Canon or Nikon that has the T-ring attached I don't know exactly what makes those so special.

As for the OAG, I haven't investigated that but off the top of my head I don't think there is a solution for fitting in the 20 mm spacing when using the Photo Adapter and an APS-C camera. I seem to recall someone having an appropriate adapter made (60mm-M to 48mm?). Also seems to me there should be an off the shelf adapter like that. That eliminates the Photo Adapter and provides more space to work with,


The reducer I purchased is a vixen reducer for the VC200L. It says it on the reducer, but it appears to be either an older
Model. Thank you for the other advice too.

#8 MakNewtMan

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Posted 01 December 2019 - 01:28 AM

Which reducer do you have?

The newer reducers: https://www.vixenopt...00L-p/37229.htm or https://www.vixenopt...00L-p/37247.htm
have M60x0.75 male threads on the focuser side, and M60x0.75 female threads on the camera side.

The older reducers: https://global.vixen...roduct/37229_4/ or https://www.astrosho...r-vc200l/p,5916
have no threads on the focuser side, and M55x0.75 male threads on the camera side.
The older ones are supposed to thread into a Vixen proprietary adapter such as the 'wide photo adapter', which has M60x0.75 male threads on the focuser side, and internally it will have M55x0.75 female threads, to attach the reducer.


It's a bit complicated - if you have one of the newer ones, you need to get an adapter that has M60x0.75 male threads on one side, and whatever threads onto the OAG on the other side.

If you have one of the older ones, the only way I can think of that would work is to buy a couple of Borg adapters. The Borg 7901 (which has the required internal M55x0.75 female threads that accommodate the older reducers), and then the Borg 7522 which (I think!) will thread onto the 7901 on one side, and the other side will have male T-threads (M42x0.75) to connect to the OAG, assuming your OAG has female T-threads



EDIT: actually that would put the OAG between the reducer and the camera... depending on how much light path the OAG takes up, might need to put the reducer between the OAG and the camera instead.... not sure what the correct distance should be between the reducer and the sensor.


Thank you for helping me ID that I have an older reducer. Guess, I need to research those borg adapters you suggested. Thank you

#9 Simon B

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Posted 01 December 2019 - 02:09 AM

Thank you for helping me ID that I have an older reducer. Guess, I need to research those borg adapters you suggested. Thank you

No problem : )

 

Seems like the optimum distance between focal reducer and sensor is 63.5mm

 

https://www.cloudyni...1-m27m15ic5146/  (See post #13)

 

So depends on how much light path the Celestron OAG uses... if it won't 'fit' between reducer and sensor, you'd have to either get a lower profile OAG, or put the reducer between OAG and sensor.... not sure that's feasible unfortunately, no way to adapt the focal reducer on the camera-side of the OAG


Edited by Simon B, 01 December 2019 - 02:38 AM.

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