Let's increase the focal lenth : the Takahashi CN212 is now ready for unattended imaging in both cassegrain and newtonian modes.
Skymeca made a complete screwed optical train, including the Paracorr ans its funny (i.e. non standard) thread. Nothing move, no tilt, no nothing.
He also made a support for the USB Focus motor. Two gears from SDDI transmit rotation from the motor to the focuser knob. They can be separated just with one screw for manual focusing.
With a correct backlash compensation (1/6th) the V Curves are perfects.
The first image is NGC2175 with 7 hours exposure, there should be more ideally !