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astrophotography equipment imaging/sketching contest imaging
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#1 bjm

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Posted 31 May 2020 - 06:32 PM

I recently bought a TS130 Apo.  Flattener requires 88mm back focus.  Is the attached image correct or should I be shortening it by 6.5mm for the distance from the camera body to the sensor?  Camera is ZWO1600MM.

Thanks,

 

 

Brian



#2 YAOG

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Posted 31 May 2020 - 07:31 PM

I recently bought a TS130 Apo.  Flattener requires 88mm back focus.  Is the attached image correct or should I be shortening it by 6.5mm for the distance from the camera body to the sensor?  Camera is ZWO1600MM.

Thanks,

 

 

Brian

photo is missing.



#3 kathyastro

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Posted 31 May 2020 - 07:43 PM

I recently bought a TS130 Apo.  Flattener requires 88mm back focus.  Is the attached image correct or should I be shortening it by 6.5mm for the distance from the camera body to the sensor?  Camera is ZWO1600MM.

Thanks,

 

 

Brian

The 6.5mm from the camera body to the sensor counts as part of the 88mm.  So you need adapters/spacers to make up 81.5mm.  Sorry I can't be more specific without the picture.


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