32 mm oblique filter stop for microscopes

This is a set of oblique filters measuring 32 mm OD and 4 mm thick. I designed it to fit the swing-out filter holder of a Leitz/Leica HM-LUX compound microscope. There is a small knob on the bottom face of the filter so that you can feel where the hole is and so that you can rotate the filter from underneath.

I include micrographs showing the epidermis of a leaf from a succulent. The first micrograph
shows the oblique filter in action, while the second micrograph (with the warmer hue) is sta