Baader Planetarium2-Inch HWB 325-369 nm 2458291 U-Filter - Black

I recently bought a Sony NEX-6 which I converted to wide-spectrum by removing the hot mirror filter. I've shot IR landscapes for many years on a Canon with an 850nm filter permanently installed and wanted to experiment with UV photography.This isn't my first attempt at shooting UV - I've tried various filter combinations recommended by UV-photography blogs but never had great results. low transmission and IR leakage seem to be big problems, even when using IR filters.This is the first filter I've tried which actually produces the results I wanted. It's designed for attaching to a telescope but excels in this alternate role. The lens is also important - most modern lenses filter out UV, so unless you're going to spend a fortune on a dedicated UV (quartz) lens, older, manual lenses provide the best results.The filter comes with a 48mm thread - most of my lenses and all my other filters are 52mm so I've fitted step-up and step-down rings to make it compatible.It's also worth noting that as supplied, the filter glass is installed in its carrier the wrong way (pink side out). Baader do supply a camera adapter kit which, I imagine reverses the thread gender. However, I simply unscrewed the locking ring, VERY CAREFULLY inverted the glass and replaced the locking ring.All in all, not a cheap filter, but a good investment given the result I'm getting..