M68 OAG Off-Axis Guider

$199.00

M68 OAG (suitable for Full Frame Cooled mono camera-ASI6200MM Pro camera)

SKU: ZWO M68-OAG Category:

Product Description

M68 OAG Off-Axis Guider

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Features: 

1. Lightweight and Exquisite, 17.5mm thickness

2. Prism size: 8*8mm

3. Connect the main imaging camera and the guide camera simultaneously. No guide scope required!

4. High stability, strong connection to the telescope

5. Currently compatible with ASI6200MM Pro camera only, rather than other ZWO ASI cameras

6. For guiding, only can work with ASI mini camera currently.

 

Mechanical Diagram:

Mechanical-diagram

Usage Guider:

Connection methods of ASI6200MM Pro, 2” EFW and M68 OAG to get the best back-focus-length-solutions-55mm:

https://astronomy-imaging-camera.com/tutorials/connection-methods-of-asi6200mm-pro-2-efw-and-m68-oag.html

Before first usage of this product read manuals and install correct drivers and software.

Do you have question, answer or comment? Post here!

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    Can I use this ASI120MM-S as a guide camera with this OAG?




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      Yes but you need to pay attention to the back focus.




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    Hi. I just received the M68 OAG, which I will be pairing with your ASI6200MC-Pro. Users should note that in the case of this color camera (hence, no filter wheel), the M68 OAG cannot bolt directly to the camera tilt plate, as that won’t allow any guide camera to reach focus. Instead, longer M2.5 fasteners and a disk spacer with four 2.6 mm clearance holes on a 31 mm radius will be required between the M68 OAG and the tilt plate. I measure the prism center to be 7.5 mm from the camera side of the M68 OAG, but this dimension should be called out in your side view drawing. I also measure the lateral mechanical distance from the prism center to the closest a guide camera barrel can get and still allow full focus travel to be 31.0 mm. While the focus ring suggests 10 mm of focus travel, my unit hits a hard stop at +6 mm. This travel range should also be mentioned as a spec. I next took into account the fact that the prism presents an optical thickness of 3.1 + 3.1 = 6.2 mm, which is different from its mechanical light path of 4+4 = 8 mm. As a result, for use with the ASI6200MC Pro, I conclude that the spacer disk thickness to put the focus ring at the center of its range (+3 mm) should be 7.2 mm + the guide camera’s sensor depth. For ASI guide cameras with a sensor depth of 8.5 mm, this means an M68 OAG to ASI6200MC-Pro spacer thickness of 15.7 mm. Please either confirm my calculations, or correct them if I have missed something. Putting this info in an app note similar to the one you already provide for connecting the M68 OAG to filter wheels for use with the ASI6200MM Pro would save other customers from each having to repeat my reasoning, measurements, and calculations.




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      You will need a filter drawer to replace the EFW.




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    Can the Loadstar x2 Guide Camera fit into the guide cam holder?




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      Yes.




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    Will this work with your new 2600?




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      No.




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    Can I used with ASI-290MM? It looks back focus will not be matched with M42 thread camera. Must I purchase another mini camera?




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      You may need to know the back focus of your telescope/flattener/reducer and calculate the back foccus, since the guide camera and main camera will reach the same back focus.




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    Is it M68 female threaded on both sides?
    Thank you,
    Marco




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      There is only oneside with M68 female thread, the other side will be connected via screws.




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