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New ZWO OAG

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143 replies to this topic

#1 cargostick

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Posted 01 July 2021 - 06:00 PM

Anyone have any details from the rumor mill, or actual sources?  From Facebook, OAG-L with 12mm prism.

 

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#2 cucubits

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Posted 01 July 2021 - 06:18 PM

Well shoot. I just bought the old one and it really isn't that great...



#3 Blackhawk163

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Posted 01 July 2021 - 06:25 PM

That would be nice. I have the original, and while it works fine for what I'm paired to, a bigger pickoff wouldn't be a bad thing.

#4 Ken Sturrock

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Posted 01 July 2021 - 06:34 PM

Cool. The OAG was the weak spot in the ZWO line-up.

 

(also moved this from generic Equipment to an Imaging Forum)


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#5 dan_hm

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Posted 01 July 2021 - 06:38 PM

The most recent iteration of the standard ZWO OAG is actually good. It was the first iteration that was very rickety and cheap. Still, it's good to see a bigger prism.



#6 Lead_Weight

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Posted 01 July 2021 - 09:43 PM

This looks like the newer M68 OAG, but with the APSC sized tilt plate on it. Here's to hoping it's just like the M68, and can be swapped out without changing spacing.


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#7 oatmeal

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Posted 01 July 2021 - 10:25 PM

Boo! M68 version literally shipped today. Would have held off had I seen this
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#8 Sayfog

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Posted 01 July 2021 - 11:06 PM

They say coming soon - hopefully that means real soon, also it might be possible the old M68 OAG will discontinued? out of stock on their website right now



#9 ChrisWhite

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Posted 02 July 2021 - 05:57 AM

I asked Sam to make this back in December, and it's taken a little while to come together but should be a nice improvement if you use a large sensor guidecam such as 174mini or Ultrastar. 

 

When he was going through development he told me that it will require 5mm additional thickness to accommodate the larger prism so a bit more backspacing consumption.  This will have an impact on some image trains, but I think most people will be able to make it work.

 

I should be receiving this new OAG very soon.  I was told it was ready for shipping to me and I just made payment so hope to have it next week.


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#10 RogeZ

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Posted 02 July 2021 - 08:14 AM

Hey Chris: Thats good news, I think most folks will be able to lose 5mm of backfocus. Thats not bad.

#11 oatmeal

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Posted 02 July 2021 - 08:19 AM

Is this just pictured with a tilt plate attached? Or is a tilt plate integrated into this new design? An extra 5mm means this won't work with any 2600MM setups requiring 55mm backfocus without ditching the tilt plate.


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#12 Deesk06

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Posted 02 July 2021 - 08:28 AM

Is this just pictured with a tilt plate attached? Or is a tilt plate integrated into this new design? An extra 5mm means this won't work with any 2600MM setups requiring 55mm backfocus without ditching the tilt plate.

Why couldn't you just remove the tilt plate from the camera and use the one that presumably is included with this OAG? Either way one of them should be removed as there is no need for two. From the looks of it, it doesn't seem to be fixed. Those bigger hex screws are the ones that you usually use to attach the tilt plate. 

 

I also may not be understanding you correctly, but overall I don't see the major issue. Even if this OAG is 5mm extra at 22.5mm that can still give you a backspacing of 12.5mm(removed tilt plate) - 20mm(EFW) - 22.5mm OAG = 55mm

 

Edit: I think I understand what you are saying now. IF the tilt plate is not included in the extra 5mm, then yes I can see your point. That would mean with the tilt plate removed, you would have 12.5mm - 20mm - 22.5mm=55mm and no way to adjust for tilt. IF  you needed a tilt plate then your backspacing is already over 55mm at 17.5mm - 20mm - 22.5mm = 60mm.


Edited by Deesk06, 02 July 2021 - 08:34 AM.

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#13 RogeZ

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Posted 02 July 2021 - 08:51 AM

I would guess the design is the same as the M68 OAG just with the larger thickness. So the tilt plate is removable.

For some scopes it wont work but for many it will. My custom Celestron OAG setup makes my 6200MM much thicker than nominal and I lose the tilt plate in some configurations. 


Edited by RogeZ, 02 July 2021 - 08:51 AM.


#14 ChrisWhite

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Posted 02 July 2021 - 10:41 AM

From what I understand it will be 22.5mm thick total and tilt plate removable so either 54mm or 68mm can be used. Still thinner than the other large prism options.
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#15 Fitz8710

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Posted 02 July 2021 - 12:44 PM

It would be super nice if they would make another 16.5mm with a bigger prism. I cant afford anymore room (because of backspacing for cc) with a filter wheel and a paracorr 2.

Edited by Fitz8710, 02 July 2021 - 12:44 PM.


#16 ChrisWhite

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Posted 02 July 2021 - 01:11 PM

It would be super nice if they would make another 16.5mm with a bigger prism. I cant afford anymore room (because of backspacing for cc) with a filter wheel and a paracorr 2.


Unfortunately, not gonna happen. Space limitations prevent it.

#17 Deesk06

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Posted 02 July 2021 - 02:14 PM

Unfortunately, not gonna happen. Space limitations prevent it.


I know nothing about what it takes to make these, but why would it need to be thicker if you have a bigger prism? Seems like they could use the current M68 and just make the prism bigger. obviously that's not the case, so I'm just wondering why it's not possible. Prism gets thicker as it gets more surface area?


Edited by Deesk06, 02 July 2021 - 03:24 PM.


#18 ChrisWhite

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Posted 02 July 2021 - 02:44 PM

That's right. A 12mm prism takes up more space than an 8mm prism. Also the prism stalk must be larger to accommodate the larger aperture to the guide camera.
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#19 freestar8n

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Posted 02 July 2021 - 05:47 PM

I hope there is a wide view of the prism through the guide port, and that a 1.25" guide camera can slide into the helical focuser.

 

If so this looks good.

 

I gather the ASI camera mounts inside the outer adjustment screws so the tilt can be adjusted with the camera attached.  This is also good - but it does mean the guide port is farther out than it might otherwise be.

 

Frank



#20 ChrisWhite

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Posted 02 July 2021 - 06:46 PM

I hope there is a wide view of the prism through the guide port, and that a 1.25" guide camera can slide into the helical focuser.

If so this looks good.

I gather the ASI camera mounts inside the outer adjustment screws so the tilt can be adjusted with the camera attached. This is also good - but it does mean the guide port is farther out than it might otherwise be.

Frank


The imaging camera mounts on the other side. Tilt plate is on the ota side.

#21 Sayfog

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Posted 12 July 2021 - 04:31 AM

Also looking on the ZWO website the current M68 OAG now appears under discontinued.... the arrival of the new version can't be far away.



#22 ChrisWhite

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Posted 12 July 2021 - 06:38 AM

Also looking on the ZWO website the current M68 OAG now appears under discontinued.... the arrival of the new version can't be far away.


Interesting. I will have mine Wednesday, so can't be too much time before ready for general shipping.

#23 TareqPhoto

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Posted 14 July 2021 - 08:59 AM

Keep updating please, i don't have any OAG yet and i keep thinking about one, not sure which one because i have QHY and ZWO cameras, so this new ZWO OAG could be good item to watch and think about.



#24 Lead_Weight

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Posted 15 July 2021 - 07:53 AM

Looks like they're up for preorder, with early delivery in August. $199, and maintain the 55mm back focus distance. Not sure why they decided to include a tilt plate since all the camera's this works have them already. I ordered a couple this morning for my systems that have a 174mini camera.



#25 xthestreams

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Posted 15 July 2021 - 11:55 AM

I’m hoping it’s to fix the light leak issue with the old M68 plate, but um no, it’s a bundled M48 plate… ****
 

Looks like they're up for preorder, with early delivery in August. $199, and maintain the 55mm back focus distance. Not sure why they decided to include a tilt plate since all the camera's this works have them already. I ordered a couple this morning for my systems that have a 174mini camera.


Edited by xthestreams, 15 July 2021 - 11:58 AM.



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