Schott UG-1 (UG1), UV-Pass Camera Filter, 52mm, Ultraviolet, and Dual Band IR, Photography.
This is 2mm thick, I also have 1mm thick available, or any thickness on request (check my other listings, or ask me to list one if you are interested).

This filter is quality made from genuine Schott UG-1 optically polished filter glass. Precision crafted size, thickness, and edges. Freshly made from new glass.
Custom mounted in a quality standard sized 52mm camera filter frame (with front and rear threads). Cut and mounted in the USA.
(Schott filter glass is the very best premium quality filter glass in the world. If you want a quality filter then get one that is made of Schott filter glass)

Glass:  Schott UG-1 (UG1)
Filter thread size:  52mm
Glass thickens:  2mm
Visual color:  Opaque
Type:  Ultraviolet bandpass filter, and dual band UV/IR filter (see graph above)
Used for:  UV photography, and dual band UV/IR photography
WARNING:  DO NOT use this filter for visual observation. Sunlight and other light sources contain ultraviolet radiation which will damage your eyes!

This filter passes UV in the 300nm to 400nm range, it blocks visual light, and it passes some IR in the 700nm to 800nm range.

Ultraviolet photography use: 
This listing is for Schott UG-1, and the transmission is very similar to U-360 glass (which I am listing separately), please review the graph above to decide which is best for you (see my other listings for U-360 if you prefer that glass type instead).
U-360 transmits UV stronger and suppresses IR better than UG-1, therefore U-360 does not require quite as much added IR suppression for UV-only photography, however both work well for UV-only photography when stacked with the appropriate IR suppression filter (such as S8612, BG40, BG39, or BG38, check my listings for those if needed).

Dual Band use:  This filter can be used alone on a full spectrum converted camera for dual band infrared photography that needs no channel swapping for blue skies.
With this filter you can capture blue/lavender/purple skies and white/off-white foliage (depending on white balance used) with no need for swapping red and blue channels.

This filter may also be useful on regular non-converted off-the-shelf stock cameras by using longer exposures, but results will be much more satisfying when using a full spectrum converted camera.

Filter labeling options:
I am currently using Gold text on Black background (the photo may not represent the label color I am currently using).
I also have:
Black text on White background, White text on Black background, and Black text on Yellow background.
Other label colors are available on request.

I am happy to make this and other hard to find specialty filters, sizes, thicknesses, and shapes available to you on request.
Feel free to message me if you have any questions or requests. Please let me know if you find any errors in my listings.
Thank you!