People are asking the connect methods of ASI2600MM Pro: How to use it with the new 36mm EFW? How to reach the 55mm back focus distance? What accessories I need and can I add the original OAG or OAG-L into my imaging train?

To get all of the answers of these questions, you need to read this instruction.

 

1. The Basic Connection Solution:

No filter wheel or filter drawer in this solution, only adapters or the original OAG.

Suitable for telescope up to f/4.8

APS-C format cooled camera - 55mm back focus length solution

 

You can change the T2-M48 16.5mm into the original OAG. But please note that the OAG will block the sensor in a bit if the thread of the end side of your telescope is M42.

 

2. Using 36mm EFW:

This solution can be divided into 3 cases: with the original OAG and adapters, or with the OAG-L, or with adapter only.

1) With the original OAG or adapters:

Suitable for telescopes up to f/5.4

APS-C format camera + 36mm EFW + OAG

 

In this case, the connection method can be very convenient with the use of threads. You can take the full advantage of the accessories you have. A few notes:

– The original OAG can be replaced to T2-M48 16.5mm extender;

– The original 36mm EFW and new 36mm EFW will both work;

– T2-T2 2mm adapter can be found in the package of 36mm EFW;

– The back focus distance in this case is 56mm;

– Like we mentioned above, the original OAG will block the sensor in a bit if the thread of the end side of your telescope is M42.

 

2)With OAG-L:

Suitable for telescopes up to f/4.2

 

连接OAG-L和新36mm-EFW-英文

You can leave the adapters aside and directly connect the new 36mm EFW to the camera via screws in this case, the distance from the sensor and the filter will also be much closer. A few notes:

– The M42 sensor tilt adapter attached to the camera need to be taken off;

– The original OAG can not be replace to OAG-L, but if you have the M68 OAG, you can also use the M68 OAG instead;

– This method does not support the telescopes with M42 threads at the end side.

– M48/54/68 sensor tilt adapter can be bought separately.

 

3)No OAG, with adapter only:

连接M42M-M48F-22.5L和36mm EFW-英文

This method only supports the telescopes with M42 or M48 threads at the end side。 The M42M-M48F 22.5mm extender needs to be bought separately.

 

3. Using 2” EFW:

Being the same as Solution #2, this solution can be divided into 2 cases: with the original OAG and adapters, or with the OAG-L.

1) With the original OAG or adapters:

APS-C format cooled camera + 2inch EFW

– The back focus distance in this case is 56mm;
APS-C format cooled camera + 2inch EFW + OAG

– The back focus distance in this case is 56mm;

 

2)With OAG-L:

连接OAG-L和2寸EFW-英文

This method is quite similar to Solution #2 → 2), so we do not go into details here.

 

4. Using 2” Filter Drawer:

APS-C format cooled camera + OAG

APS-C format cooled camera + M42 filter drawer

 

Above the 4 solutions for the ASI2600MM Pro APS-C camera to reach the 55mm back focus length. Indeed there are more than 4 solutions in total, but these are what we most recommend. If you have any questions about this guide, please do contact us, we are glad to help!

61 Responses to [ASI2600 Guide] 4 Connection methods to get 55mm back focus length
  1. Avatar

    We regret to say that we can only provide some standard connection methods.




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  2. Avatar

    What is the connection solution for a RASA8 – Starizona filter holder and the ASI2600




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  3. Avatar

    Where do I purchase a m42 male m48 female extender as In example 3 above? The extender is 22.5 mm in length. Do you have a item number?




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  4. Avatar

    Let’s say I have a fast astrograph that is faster than f/4.2.
    What are my options for the ASI2600? No filters, no OAG possible?




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  5. Avatar

    Hello, I have a newton 250Quattro F4, what filter wheel should I buy if I want the camera 2600mm? And what method should I use for the backfocus? Thank you




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  6. Avatar

    Is it possible to remove the tilt adapter from the 2600mm, mount the new 36mm filter wheel directly to the camera, then mount the tilt adapter directly to the scope side of the filter wheel?

    This would bypass the OAG in option #2 and then require a custom length adapter from the tilt adapter to the Focal Reducer.
    If this is possible, what size and threads are on the tilt adapter? M48?

    Thank you.




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