[click on image gets you a larger image]
Here some examples shot in reflected ultraviolet (UV) light. UV filter used on my multispectral camera for reflected UV photography was a stack of Schott UG11 + S8612 ionic glass filters. A 365nm UV LED light was the light source. Background was a white 100x100mm Spectralon (R) calibration target.
These both were ZWB2 filter glass which its equivalent is SCHOTT UG1.
|82mm ZWB2 filter in reflected UV (365nm)|
|52mm ZWB2 filter in reflected UV (365nm)|
Let me be very clear: I'm not stating that these issues will always be there or how likely these issues will be, as I have no data on this. Just be careful and test out your filters! For my part I will stay with SCHOTT or HOYA filter glass, as I never had any issues like that...
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos