That X-Ray thing is pretty weird. I read on how it works and it sounds like their P2&4 filters are just doing the same thing any IR filter would do. Someone with an IR filter needs to do the experiment and see if it works .. before someone goes out and pays twice the price for one of the Kaya's .. Then let me know so I can plan my trip to Victorias Secrets at the mall followed by a visit to the beach. LOL
I have done some work with IR, and I have done so at the beach. In my case, I was working without knowing the "x-ray" effects it could have. I have to say that I have not seen any such phenomena. After reading about it a little bit once I discovered it, it seems that only specific materials do that, and they don't appear to be popular at the beach from what I have seen.
I used to shoot with an F828 and yes, the x-ray does work quite well. Due to "voyer" problems, Sony changed the way NightShot mode works, so to actually see through anything you need an addional filter. Hoya makes one, it's about $120.
I'll have to see if I can find any of my samples, but, it shoots thru most thin items. Say for instance you spilled ink on a piece of paper, you can take a picture with NightShot and the filter one, and see thru the stain and see the word printed on the page.
Also the F828's flash emittes IR light, which allows the camera to see.
lenses. My later work is done with a first generation Sony Alpha....