Quick hack from Hello Raspberry Pi:
Just bought a Pi NoIR (Infrared version of Camera Module). Then I want to test the effect of infrared photo with Hoya R72 filter (for Infrared Photography to blocks Visible Light Up To 720nm). So I have to add a 52mm filter mount on the Raspberry Pi 2 case.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!