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

20 Responses to The best solution of 55mm back focus length
  1. 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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  2. 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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  3. 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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  4. Printed, laminated, and kept in the case with my cameras. Thanks Sean!




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




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  6. 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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  7. Excellent guide!




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