M68 OAG Off-Axis Guider

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$199.00

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

Available on backorder

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. Can be compatible with ASI6200MM Pro and ASI2600MC Pro camera

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

7. There’re M2.5*8 screws in the package to help connect the OAG to 2″ EFW.

 

Mechanical Diagram:

Mechanical-diagram

Usage Guider:

5 connection methods of ASI6200 to get 55mm back focus length:

https://astronomy-imaging-camera.com/tutorials/5-connection-methods-to-get-55mm-back-focus-length.html

Before first usage of this product read Manuals and install correct Drivers and Software.

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

  1. Avatar

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    What is the diameter of the hole where the light passes from the prism up into the guide camera? The prism on your regular OAG is also 8mm x 8mm, but the hole is only 5.6mm in diameter, so limits what size sensor to use. It seems the ASI174MM Mini sensor is too large and a bit wasted on such a small aperture. I’m hoping the M68 OAG has larger opening. Thank you.




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      The diameter of the hole in the M68 OAG is the same as the regular OAG.




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    can you move the prism up or down in the M68 OAG? If so how to do that?




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      Yes, you can loose the retaining screw for prism stalk, it is near the red ring, then you can pull or push the prism stalk.




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    Hi!

    Another question please: what is the shorter distance between the center of the M68 thread and the prism? Thanks a lot!




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      Could you send an email to support@zwoptical.com and show us the distance you refer to?shall we confirm the distance you refer to by graph? So we can give you more precise data according to your need? The prism stalk can be adjusted and the distance can be changed.




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    Hello,

    It would be very appreciated if you’ll provide a more detailed drawing of your M68 OAG and a manual! This is my question: what is the distance between the M68 female thread and the movable prism holder?

    Thanks a lot!




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      Could you send an email to support@zwoptical.com and show us the distance you refer to? Shall we confirm the distance you refer to by graph? So we can give you more precise data according to your need? The prism stalk can be adjusted and the distance can be changed.




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    What is the weight of the M68 OAG?




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      The weight of the M68 OAG is about 100g.




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    Just to confirm, will this work with the ASI120mm-Mini as an OAG?




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      Yes, the ASI120MM Mini can work with M68 OAG.




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    Good day,
    what is the thread length M68?
    Well thank you,
    Lukas




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      What do you mean of thread length? We can tell you some details of M68 OAG, the thread spacing is 1mm, and the thread depth is 5mm. I hope it can help you.




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    What is the minimum back focus distance for the guide camera? I assume the focuser has 6mm of travel?




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      The back focus is depend on your telescope which has flattener or reducer. The travel of this focuser is enough to use normally.




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    Hi,

    Why this OAG is not compatible with ASI2600 ? the front plate on 2600 has same fixation hole system than 6200.

    Thank you,
    Sebastien.




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      Sorry we don’t have a adapter that suit for M68 OAG and ASI2600. But you could connect M68 OAG and ASI2600 with 2″EFW.




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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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