How to connect ASI6200MM Pro, 2″ EFW and M68 OAG to get the best back-focus-length-solution of 55mm?

Basically it’s like what the diagram showed below:

ASI6200MM Pro camera (12.5mm)+ 2”EFW(20mm)+ M68 OAG(17.5mm)+ sensor tilt adapter(5mm)=55mm


And here are the detailed steps:

1) Disassemble the 5mm sensor tilt adapter on the main camera with the help of a screwdriver:

connect ASI6200 with 2inch EFW-1

2) Remove the back cover of EFW:

connect ASI6200 with 2inch EFW-2

3) Disassemble the filter wheel carousel (Note: Please do not disassemble or move the central screw of this carousel, otherwise the EFW will be damaged):

connect ASI6200 with 2inch EFW-3

4) Align the four screw holes of EFW with these in the four corners of the camera chip as shown below:

NO.5 对准EFW与主相机接口位置

5) Tighten the screws at the interface between the EFW and the main camera:

connect ASI6200 with 2inch EFW-5

6) Install the filter wheel carousel:

connect ASI6200 with 2inch EFW-6

7) Fix the M68 OAG to the back cover of EFW(Note: You may reposition the prism to make sure it would not block the sensor):

connect ASI6200 with 2inch EFW-7

8) Fix the 5mm sensor tilt adapter to this M68 OAG:

connect ASI6200 with 2inch EFW-8

9) Attach the back cover of EFW to the front cover:

connect ASI6200 with 2inch EFW-9

10) Installation completed.

connect ASI6200 with 2inch EFW-10


Note: Please make sure the prism does not block the sensor or your telescope.

Adjust the focal length of a guide camera by using the guide knob.

Would be better if you finish the above steps during daytime, as it is very difficult to adjust it accurately at night.

20 Responses to Connection methods of ASI6200MM Pro, 2” EFW and M68 OAG
  1. Avatar

    Will you build an Adapter for Canon Lenses in combination with ASI6200 and Filter wheel.


  2. Avatar

    Are all the threads from the camera to the scope 42mm?


  3. Avatar

    How does this filter wheel connect to the ASI294MC Pro?


  4. Avatar

    How is the connection without the OAG? If the EFW is fied with screw tot he ASI6200 directly, what would the connection be on the telescope side (M48) without the OAG? How would the tilt adapter fit in?


  5. Avatar

    Will this Configuration also work with the ASI2600MC Pro? Can you provide the same instructions to connect the ASI2600MC Pro with the 2″ Filter Wheel and the New OAG? Thanks in advance :) I have ordered the ASI2600MC Pro and will need instructions for this.


  6. Avatar

    If I may telle something : it will be interesting to put the sensor chip 90° the position you show on your picture. Doing that, it is easier to balance on a newtonian telescope, et and you can do the right orientation for delta and alpha (alpha on the long side of the sensor, delta on the small one.
    If I explain badly, don’t hesitate to ask. But your solution is also very cool!


    • Avatar

      Thanks for your feedback and I will sent your message to our devs.
      When you connect the camera to the scope, the orientation of the camera won’t always be fixed as it is shown in the picture.


  7. Avatar

    Can sensor tilt adapter be skipped? it seems like it can cause some vignetting.


  8. Avatar

    ASI6200MM Pro, 2” EFW and M68 OAG – assuming all the filter wheel positions are utilized, what is the approximate weight of this assembly?


  9. Avatar

    Does this filter wheel have adapters to connect to other cameras, such as a DSLR?




Leave a Reply

Your email address will not be published. Required fields are marked *