How reach 55mm back focal length with ASI cameras? We prepared detailed guidelines for all our cameras.

Notice: About small format, 174, 178, 385, 290, 224, 185, etc. The pacakge does not include some adapters, please take a look at the diagram of package list in product description.

Cooled Color Camera solution(Full frame-ASI094,ASI128)

 

 

Cooled Color Camera solution(APS-C)

 

 

Cooled Color Camera solution

 

 

Cooled Color Camera with OAG solution

 

 

Cooled Mono Camera solution

 

 

Cooled Mono Camera with OAG solution

 

 

 ASI camera connecting with OAG diagram

OAG

24 Responses to The best solution of 55mm back focus length
  1. Hello, the ASI 1600 has 6.5mm if backfocus I believe. Can you let me know how much backfocus is added (at the shoulder of the 1.25 piece) with the T2-1.25′′ T-Mount.
    Thank you




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  2. Hello,
    I’m a little bit confused…I have an ED80 with its flattener who requires 55mm backfocus and I put the ZWO oag and the right spacer between the oag and the main CCD (a Moravian) to reach the 55mm distance. I also want to us a my ASI 120MM as guider camera so I screwed it to the oag with the 5mm spacer. It seems both main and guider camera reach the focus but I tested from home toa far hill. What if I should fine tune the guider camera focus on the actual night sky? No adjustment is allowed now..am I missing something? Thanks in advance.
    Clear skies!




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  3. Would you be so kind to add a diagram that has the following: 1)ASI camera, 2)filter wheel, 3)oag, and 4) adc.




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  4. Hi,

    I use a skywatcher coma corrector model GPU 4 lenses, and it asks for a backfocus of 55, how to have them because I use a 1600 mm pro asi with EFW mini and halrvb zwo filter.
    Thank you




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  5. I’m a little confused with the 21mm T2 Extender, some ZWO Articles specify it as T2 Extender [https://astronomy-imaging-camera.com/…/best-back-focus…], whilst others specify an M42 Extender [Item 6 in the interface drawing: https://astronomy-imaging-camera.com/…/QuickGuide…].
    Wiki defines M42 as 42mm x 1mm thread pitch and T2 as 42mm x 0.74mm thread pitch. Can anyone pleas clear up my confusion as I wish to get focus on my ASI1600C-Cool with ZWO OAG, using the ASI120MC as the guide camera. Many thanks for any clarification.




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  6. Printed, laminated, and kept in the case with my cameras. Thanks Sean!




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  7. What a great resource to make sure that you are setup correctly.




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  8. Dear Mr Wang,
    I purchased the asi224MC cooled in the UK several years ago when it was first released and it certainly was not shipped with the extenders that are illustrated in the diagram. Were they meant to have been?




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  9. Excellent guide!




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