Rosco Double Coated UV Pass experience?

Has anyone tried the Rosco Double Coated UV Pass?

It’s a fairly cheap alternative to the “professional” and expensive uvpass filters

I found several threads mentioning it, but no hands on experience on their efficiency/limitations

That UV-pass filter has its peak transmission around 400nm, it will not get rid of purple glow. It would filter out most of the white 'byproduct' light of the Ledengin UV emitter, but also nearly all of its 365nm light. What would you use it for?

Oh. Haven’t seen that graph. Thought it would pass all uv below 400 nm. Thanks!

Crap! :-p

I would use it to test how much visible light it would block. When shinning my 365 LedEngin on amber, it’s fluorescent alright. But the amount of visible light makes it harder to see.

Yellow glasses makes it a better, but could be better.

No experience with those lenses. Look interesting.

My preference is to allow visible light output and then wear protective goggles to protect my eyes from UV through Blue. So I don't see the visible light, but it does strike my target. My reasoning for that is that some objects fluoresce best in the visible spectrum. For instance, my wife does forensic work. She uses different 2 main spectrum for finding certain types of biological evidence. If I remember correctly, she uses 445nm for blood and 405nm urine and other substances. My 445 lasers brilliantly fluoresces all types of stuff outside. I don't know off hand how much of the 445nm laser's output goes into the UVA spectrum though.

Here is a beam shot of a 2 watt 445nm. No filter on camera, but of course I was wearing protective goggles. Notice the fungi, moss, or whatever it is fluorescing on he nearby branch. The camera must be a bit overwhelmed by the beams. In real life with protective goggles on, I don't see the beam, but I doe see the hot spot and a lot more stuff fluorescing in the beam's spill. Also, the beam is more of an intense blue with violet tint. For some reason, it looks very light blue in the picture.

Usually it is lichens, they show a nice fluorescence in red, orange or green when illuminated by light from deep uv to blue.

Thanks djozz. I think that is what I predominantly see outside on rocks and branches. It's fairly humid here and rains a lot at times.

I just found an article on CPF that shows some nice spectral output graphs of a 445nm diode based laser. It's very tight around 441nm. Here is a graph with an object fluorescing from the laser (Link to thread in picture). The first spike is from the laser itself. The second is the florescence of the object.

EDIT: Made correction to last paragraph.

I've been looking for something similar myself for a long time. All I can find are some extremely expensive professional filters and pages linking to an article saying to use a broken Blacklight bulb. Nothing that would work well for a budget-oriented 28mm flashlight filter unfortunately.

Haven’t heard about the broken Blacklight bulb. Sounds interesting Will have to google that.

Yeah the good ones are quite expensive. If it could be a help to anyone, I tried to make a list:

Expencive:

Hoyaoptics

Thorlabs shortpass filters (scroll down past longpass)

Schott Bandpass UV Filters

Schott Bandpass Filters: BG3, BG7, BG25

Schneider KREUZNACH SP 615 Shortpass filter

Schneider KREUZNACH B+W 403 UV pass filter

Asahi Spectra Shortpass Filters

Edmundoptics TECHSPEC® filters:
TECHSPEC® Fluorescence Bandpass Filters

TECHSPEC® Shortpass Filters

TECHSPEC® Dichroic Shortpass Filters

TECHSPEC® High Performance OD 4 Shortpass Filters


Hoya and Schott can be bought at:

Schott at
http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3695


Less expensive :wink:

Rosco Double Coated UV Pass

Well not exatly the right spot but it appears there is an amber forum