Like you I have never had a shot from the cheap shutterless adapters that I would want to keep, the Q takes 1/13th of a second to scan the sensor, the sensor is active during this time. The only one which was good is this Moon shot taken with a 300mm lens and a cheap adapter.
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The Moon is moving, albeit slowly, it moves it's own diameter every 5 minutes. When I put my Q onto my telescope to get even more magnification I got this
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The more you magnify the more you magnify movement and this shot shows signs of blur due to subject movement, though it has to be noted that it could also be due to aperture diffraction (the scope is a 1500mm f12).
I don't think recording revolving rotor blades would be possible with the cheap adapters.
The genuine Pentax adapter does get around this problem as the sensor is only seeing light for the set shutter speed duration, the shutter cuts off the light from the sensor til the camera has finished scanning the sensor. It is overpriced, and they don't include the tripod foot that you will also need (another £50 if you can find one). But at least now I get shots I can keep.
Chris