A filter holder designed specifically to fit in the AlphaBright, allowing easy insertion and removal of optical filters from the unit. The filter holds can accommodate any standard 25.4mm diameter, 1mm thick filter.
This holder positions the filter between the bulb and a convex lens ensuring that the filters work as expected. For more information on why the AlphaBright QTH SMA is the ideal choice when neutral density, bandpass or other optical filters are required is available here.