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That looks the business mate. I'll post a pic shortly of my backyard engineering project involving an old manual focus 300/2.8. I've hobbled together an arduino/easy driver stepper focuser to the rig as well as working on implementing temp compensation. I've found through testing that the focus shifts by enough to ruin images with every degree of temperature change. I am considering two options. Temp compensation in the focuser but this will require a lot of coding that im not too sure on how I would implement and a very accurate thermal probe, or alternatively I am considering using heater bands at the front and back of the lens with a thermal probe and a PID maintaining the lens temperature at say 17 degrees all night, thus negating focus shift.
Seems there is far more involved in using a camera lens for imaging than I thought.
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