Filming in UV requires removing a filter, getting UV-transparent lenses and getting a good filter to block all other light.
I got my hot mirror removed here: http://ve42.co/UVcam
That is an affiliate link so by ordering through the link, LifePixel will give a commission back to me. If you don’t want that, just use a different link.
I’ve always been fascinated to film in the UV because it reveals to us a world that is always there but invisible to us. Most objects are not surprising but skin, dish detergent, flowers, tonic water, and optical filters are all very different in the UV part of the spectrum.
The UV-pass filter I used was the Baader-U. The other filter was the ZWB1 that you’d have to use in conjunction with an infrared blocker. I have one around here somewhere but not sure exactly where.