lens hood

Greetings I would like to 3d print 2 rings to be used as adapters for tilt shift photography . one of the rings would act like a fastener for the camera and the other would be the housing for the lens. A bellow (not 3d printed) placed between these 2 rings will act as a medium for tilt and shift. The issue is i am not sure…

I'm new to CAD and have been trying to figure out how to model a microscope lenshade with the following approximate specs: Bottom profile is a circle approx 19mm diameter Above it about 20mm, the opening profile is a rectangle approx 1.5x2.5mm (this is for a microscope lens, so the subject end is narrower than the back…