Very short review.
ZWB2 filter for 365nm light - 20.5mm diameter
Works great.
Appears to be 2 thin pieces of glass sandwiched around a very thin UV filter.
Converts a so-so UV light (Nicron B10-UV, $10) into a good one.
Removes the greenish light, which makes a huge difference.
(some things that do glow faintly, cannot be seen because of the high level of visible light from this Nicron thing)
I just glued it on the front, it;s the same diameter as the light.
Now you don’t see any light unless it’s from the thing you are trying to observe.
You get 2 of the things, for what is now $3.83 US, so I can still convert another UV light.
Aliexpress link is:
I get nothing, I’m just showing you where to go.
Shipping took a month, most Aliexpress stuff I get in 2 weeks or less.
wle