Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Vixen R200SS + ZWO ASI6200MM Pro

equipment astrophotography reflector
  • Please log in to reply
14 replies to this topic

#1 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 03 December 2020 - 11:28 PM

Hello,
I'm currently in the process of upgrading my astrophotography setup but have hit a snag and am hoping to get some hints on how to proceed.
My setup includes:

  • Vixen R200SS
  • Vixen Coma Corrector PH
  • ZWO ASI6200MM Pro
  • ZWO 2" EFW with their 2" LRGB+SHO filters
  • ZWO EAF (not relevant to this post)

As you may be able to tell, I need to ensure that the entire image train is well suited for full-frame imaging.

In theory, all of these components work well for full frame imaging, however, I'm having a hard time avoiding a reduction to M42.
I've read about many people making this work, though somehow, I haven't been able to identify the components that they ended up using.

The focuser on the R200SS has a M60 female thread.
The telescope comes with a reducer from M60 to M42, which has an internal thread on the telescope side for M56.
This M56 "accessory" thread is very important since it is what the coma corrector attaches to.
Vixen sells a similar component called the Direct Wide Photo Adapter, but I don't see how it could be utilized without going to a DSLR-style thread.

Any insights would be much appreciated, thanks :)



#2 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 04 December 2020 - 03:45 AM

So far, It think this item from Baader might be my best bet as it may be able to replace the original M60 adapter from Vixen and features the interior m56 thread
https://www.baader-p...m68t-2m68.html 



#3 andysea

andysea

    Skylab

  • *****
  • Posts: 4,372
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 09 December 2020 - 01:41 AM

I sorta remember having the same issue with the R200ss but I don't remember how I solved it.

You might want to try and call Vixen directly. They usually answer questions over the phone.



#4 AnakChan

AnakChan

    Apollo

  • -----
  • Posts: 1,232
  • Joined: 01 Sep 2014
  • Loc: Oz

Posted 09 December 2020 - 02:16 AM

So according to this :-

https://www.vixen.co...roduct/37237_9/

 

You need 56.5mm backfocus (not accounting to whatever LRGBNB filters extending that figure). The ASI6200MM with EFW, OAG & Tilt Adapter brings it to 55mm. You didn’t mention using the Tilt Adapter nor the OAG (presumably using a guidescope instead) so take back 22.5mm - your ASI6200MM & EFW is 32.5mm.

 

56.5mm - 32.5mm, you’ll need an adapter 24mm in length going from the Vixen PH M56 P0.75 female to ZWO EFW M54 P0.75 male. I’m not certain about off-the-shelf solutions but I’d custom an adapter and have up to 1.5mm in 0.5mm increment shims depending on the thickness of the filters you choose.



#5 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 09 December 2020 - 02:38 AM

Thanks for the input guys, it's great to hear that Vixen's support is worthwhile reaching out to.

I probably should have posted another update earlier, but here's my current plan of action.
I have the Baader 2458225 4-in-1 adapter I mentioned above on order through Telescopes Canada.
That adapter has a 2" thread on the inside (which is further reduced with a ring that I'll remove). It's unclear whether that 2" thread is M48. It would be ideal if it is, but one Baader page states that it is 50.4mm, which would suggest otherwise.

If the inner thread isn't M48, then I'll add the Baader 2458229 M68 to M48 adapter, which should get me the required thread at the cost of some additional backfocus.

 

Here's a rough spreadsheet with what I think will be consuming the backfocus for my two camera setups (ZWO & DSLR).

Note that I haven't included any spacers. Ideally, both totals would be negative so that I could add additional spacers to them.
I'm curious about where you got 56.5mm from for the backfocus as I had expected it to be 55mm before the tilt adapter (which I understand is required).
Please let me know if you think that anything here looks suspicious smile.gif 
Screen-Shot-2020-12-08-at-11-32-55-PM.pn



#6 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 09 December 2020 - 02:52 AM

Ah, somehow I had missed your link to the Vixen Japan page for the Coma Corrector. That's good news as 56.5mm gives me the distance I'd be lacking if everything else works out smile.gif
Screen-Shot-2020-12-08-at-11-54-09-PM.pn


Edited by areksredzki, 09 December 2020 - 03:13 AM.


#7 andysea

andysea

    Skylab

  • *****
  • Posts: 4,372
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 09 December 2020 - 09:36 AM

So according to this :-

https://www.vixen.co...roduct/37237_9/

 

You need 56.5mm backfocus (not accounting to whatever LRGBNB filters extending that figure). The ASI6200MM with EFW, OAG & Tilt Adapter brings it to 55mm. You didn’t mention using the Tilt Adapter nor the OAG (presumably using a guidescope instead) so take back 22.5mm - your ASI6200MM & EFW is 32.5mm.

 

56.5mm - 32.5mm, you’ll need an adapter 24mm in length going from the Vixen PH M56 P0.75 female to ZWO EFW M54 P0.75 male. I’m not certain about off-the-shelf solutions but I’d custom an adapter and have up to 1.5mm in 0.5mm increment shims depending on the thickness of the filters you choose.

I think you're right but there also needs to be a way to attach the corrector to the draw tube. The corrector screws onto the back of the photo adapter and then the photo adapter screws onto the draw tube. By itself the corrector can not be attached to the focuser.



#8 andysea

andysea

    Skylab

  • *****
  • Posts: 4,372
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 09 December 2020 - 09:51 AM

This might work https://www.vixenopt...pter-p/3878.htm

It looks like it might have an m48 connection on the camera side. It will vignette a bit with the 6200 but I don't think that they make an m54 equivalent unfortunately. 

The m48 thread should be confirmed with Vixen.

 

I wish they had better information on their website.



#9 AnakChan

AnakChan

    Apollo

  • -----
  • Posts: 1,232
  • Joined: 01 Sep 2014
  • Loc: Oz

Posted 09 December 2020 - 12:47 PM

My bad, I see what you’re saying. I actually have the Wide Photo Adapter & the beefier 60DX for that matter so I could do some measurements with the calipers if needed.
  • andysea likes this

#10 andysea

andysea

    Skylab

  • *****
  • Posts: 4,372
  • Joined: 03 Sep 2010
  • Loc: Seattle, WA

Posted 09 December 2020 - 08:14 PM

It's such a strange system, I wish they made it like the Epsilon where the corrector is installed in the draw tube and then the adapter screws onto the corrector.

Edited by andysea, 10 December 2020 - 08:27 AM.


#11 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 10 December 2020 - 01:07 AM

It'd be great to know the dimensions of the Wide Photo Adapter if you can measure it :)
The reason I went with the Baader 4-in-1 adapter is because it has an M60 male thread and M56 female thread on one side, which should be what's require to attach it to the telescope with the coma corrector on the inside.
I couldn't find much information about the wide photo adapter when I was ordering components, but Teleskop Service mentioned a free aperture of just 46 mm.

My understanding was that M48 shouldn't cause vignetting since it's the same size as the filters, is that not the case?


Edited by areksredzki, 10 December 2020 - 02:06 AM.


#12 AnakChan

AnakChan

    Apollo

  • -----
  • Posts: 1,232
  • Joined: 01 Sep 2014
  • Loc: Oz

Posted 10 December 2020 - 05:22 AM

Warning: Picture Heavy Post Part #1

Sorry to get your hopes up. Looks the like the one I have is the more general one :-

 

https://www.vixen.co...roduct/3878_09/

 

vs the one for EOS & micro4/3 (the one Andy shared) :-

 

https://www.vixen.co...roduct/3876_01/

 

If it helps, I can show the one I have :-

 

Top/camera end :-

IMG_5190.jpeg

 

Bottom/OTA end :-

IMG_5191.jpeg

 

Made up of 2 pieces :-

IMG_5192.jpeg

 

Side profile, you'll see that the bottom part is male threaded (presumably into the focuser drawtube). It's ~60mm  :-

IMG_5185.jpeg

IMG_5189.jpeg

 

Side profile of the "Common" piece :-

IMG_5186.jpeg

 

Now it's the Common piece that has a female thread that attaches to the PH corrector :-
IMG_5187.jpeg
 



#13 AnakChan

AnakChan

    Apollo

  • -----
  • Posts: 1,232
  • Joined: 01 Sep 2014
  • Loc: Oz

Posted 10 December 2020 - 05:36 AM

Warning Picture Heavy Post #2

 

Unfortunately, on the camera side of my "Common" piece, it's 42mm :-

IMG_5184.jpeg

 

I don't know what the size is for the other one Andy linked. It may well be 48mm.

 

I also have the Vixen Wide Adapter 60DX that's heavier duty :-

IMG_5193.jpeg

 

Same with it on the underside, is a male thread 60mm for the drawtube :-

IMG_5194.jpeg

 

Dismantled in 2 pieces :-

IMG_5195.jpeg

 

Female threading on the "camera" piece that measures the same 55.14mm (presumably for the PH corrector M60 male thread) :-

IMG_5196.jpeg

IMG_5197.jpeg

 



#14 AnakChan

AnakChan

    Apollo

  • -----
  • Posts: 1,232
  • Joined: 01 Sep 2014
  • Loc: Oz

Posted 10 December 2020 - 06:10 AM

Warning Picture Heavy Post #3
 
The camera mount flange can be removed with 6 screws :-
IMG_5198.jpeg
IMG_5199.jpeg
 
But there is no threading for the camera side :-
IMG_5200.jpeg
 
So it seems the default Vixen adapters have only DSLRs in mind. Circling back to Andy's option is to see if that has a wider threaded opening.
 
I also found this on the Japanese Google Image search (original Japanese blog seems to have disappeared) :-

img_18_m.jpeg
 
Don't really need to learn how to read the Kanji or Katakana to get an idea of what's going on but I think that pink portion is customised to work with the 60DX. This provides measurements too which may be useful for you.


Edited by AnakChan, 10 December 2020 - 06:20 AM.


#15 areksredzki

areksredzki

    Lift Off

  • -----
  • topic starter
  • Posts: 6
  • Joined: 30 Nov 2020

Posted 10 December 2020 - 01:54 PM

Thanks so much AnakChan, I wish I had these pictures earlier, but thankfully they seem to confirm that I made the right choice :) 
I'll be sure to share similar screenshots and measurements of the Baader components once I get them. Hopefully it'll all fit!




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics





Also tagged with one or more of these keywords: equipment, astrophotography, reflector



Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics