M49-M26 lens filter thread to objective adapter

My setup:

• Objective: 10X EO M Plan Apo ELWD infinity corrected (M26x36TPI)
• Tube lens: Carl Zeiss Jena 3.5/135mm (M49x0.75)

It covers a full frame with minimal vignetting at full aperture on the tube lens.

Printed with PLA, 0.6mm nozzle, 0.1mm layer height. The thread came out very nicely.

I painted it black. 

It's a bit hard to take off from the filter thread. Remove the objective first, then rub the flat surface of the adapter with your palm. 

Source: https://github.com/keshuaixu/microscopy/blob/master/m49m26.scad

Requires fork of threadlib: https://github.com/keshuaixu/threadlib/tree/lens_threads