This rotatable filter wheel holds up to six 1 in./25 mm filters and allows users to quickly and accurately switch between the six. The thin, lightweight assembly has detents in 30-degree increments, allowing for users to "click" the wheel into 12 different positions. The wheel is designed so that two wheel assemblies can be positioned face-to-face on a breadboard with less than 20 mm separation. A separate C-Mount adapter allows the filter wheel to mate with various C-Mount components. Common applications for the filter wheel include fluorescence imaging, attenuation of low powered lasers, and variable filters for machine vision inspection.