150mm Filter Tray Adapter

Filter tray adapters to allow use of common 3 and 4" sized filters in the non-standard 150mm filter trays on matte boxes that came with 35mm Konvas and Kinor cameras. They are designed to hold Tiffen glass filters, which are generally up to ~4mm in thickness.

As is usual with Soviet-era camera gear, not every filter tray is manufactured in the same way; these adapters fit perfect in some of my filter trays, and are loose/tight in others. You may need to tweak the source to fit your specific unit.

Designed with [FreeCAD](http://www.freecadweb.org/). Source files available on Github: https://github.com/fdiebel/filter-tray-150mm