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 M68 OAG 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 2 cases: with the original OAG and adapters, or with the M68 OAG.

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 M68 OAG:

Suitable for telescopes up to f/4.2

APS-C format cooled camera + 36mm EFW + M68 OAG

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 M68 OAG;

– 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. 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 M68 OAG.

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 M68 OAG:

APS-C format cooled camera + 2inch EFW + M68 OAG

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!

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

    I have the EFW mini with Astrodon 1.25″ NB filters…will this setup work with the ASI2600MM or do I need 2″ filters?




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    Why does ASI2600MM come with very small M42 sensor tilt adapter? And when using ASI2600MM with the M68 OAG, I have to buy bigger sensor tilt adapter for very high price (near 30$ if I’m not mistaken)!!! It’s a waste of money.




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  3. Avatar

    Where can I find the M48 sensor tilt adapter (shown above in the diagram)? I cannot find it in your shop.




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    Hi, I want to purchase the ASI2600MM special kit with the 36mm filters and M68 OAG.
    How do I select the above configuration (APS-C, 36mm New EFW and M68 OAG) ?

    Thanks
    Uri




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  5. Avatar

    Hi, I want to purchase the ASI2600MM package deal, when will you update the ASI2600MM page to show the above configurations ?
    Do you confirm the above configuration is final ?

    Thanks
    Uri




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  6. Avatar

    Hi, have just purchAsed the 2600 with m68 OAG and 2 inch 7×2 filter wheel. I also have a Celestron 0.7 reducer. Will I have to compensate for anything regusrfing back focus.?
    Will it still be 55mm?

    Thanks for your time.

    Neil.




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