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distance to test object: ~ 1.5km
hight of static part of focuser from top of mounting plate: 2.4cm
camera at prime focus:
Distance top of static part of focuser to top of moving part: 4.4cm
==> 6.8 cm from mounting plate to focal point
(40mm K. eye piece focusing same object:
Distance top of static part of focuser to top of moving part: 3.3cm
why was this measurement necessary?)
the image quality was really poor. washed out, blurry, dark.
I hope that was caused by high humidity, warmer tube than outside air and my awkward acrobatics on the back seat of the car ...
will have to repeat test on stars with scope properly mounted and cooled.
but view through 40mm K was good.
the FOV was much bigger through the eyepiece, too. ... must keep that in mind that the camera produces such a tiny field!
the 1st photo was taken with same settings as the prime focal one: ISO 200, 1/250secs - it shows the object on the distant hill at the horizon.
2nd photo: prime focus
3rd: prime focus cropped and lightened
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