QHY11 model 2014 - Backfocus

QHY11 model 2014 - Backfocus
« on: March 20, 2020, 10:09:00 am »
Hello to all.
I write because I have a lot of confusion regarding the back focus of my QHY11 and I can't find a correct data.
I need to know the correct backfocus of qhy11, I purchased it in 2014 used and I hope that knowing this can help you give me the correct information.

I found the following backfocus online, all different from each other
a) 13.5mm
b) 17.9mm
c) 12mm
and this does not help me understand.

I need to know this
a) backfocus WITHOUT tilter, to be clear: from the external glass to the sensor surface
b) thickness of the titler, or better: backfocus from the tilter to the sensor.

Without these data I cannot use my sensor because I have many problems at the stars in the corners.

Thank you


Re: QHY11 model 2014 - Backfocus
« Reply #1 on: March 23, 2020, 09:31:44 pm »

Sorry for your unpleasure experience. We will check it soon.

Best  Regards!


Re: QHY11 model 2014 - Backfocus
« Reply #2 on: March 24, 2020, 09:42:52 pm »

The backfocus without tilt adapter is 11.5+-0.5mm.
The backfocus with tilt adapter is 15.5+-0.5mm.

Best Regards!