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QHY CCD distance to the sensor
Sensor surface glass to front of camera:
QHY9 15mm (w/o optic window) 27.5 mm (w/ optic window) (the front nose piece screws off and is about 12.5mm, they call this the optic window).
Sensor surface to real silicon surface: Approx. 1.5mm to 2mm
Note: All CCD’s except the QHY11 have M42/0.75” inner thread connections
Hope that helps, you just need to add the filter and FW thickness. The FW case is 18mm.
Mark
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