UVA Filter Kodak Wratten HELP for SCIENCE

[TheLitBull]

Guys, I'm doing a science project, using my Canon DSLR (T1I)


Here's an exceprt from a published research paper.

Equipment for the fluorescence photographs included
a Minolta X-700 camera body with a Tamron 90 rnm
macro lens. A Kodak Wratten #4 filter (Rochester, N.Y.)
was placed on the lens to block all UV light and pass only
visible light.

What is a Kodak Wratten #4 filter? Is #4 referring to the Kodak Wratten number, so like the lens that blocks yellow light?

 

[Garbz]

Other way around. #4 is the Wratten number, and it is a yellow filter. It will PASS yellow light, and block UVA.

UV-A is 400 nm–315 nm. What are you trying to achieve? Your typical UV filter will pass around 65% at 400nm, and down to 10% below 360nm. Petty little info is floating around the net for a #4 filter which definitely does not pass all visible light.

 

[TheLitBull]

thanks for the help guys.


I'm interested in passing the yellowish orange fluorescent light that a certain bacteria gives off. Its porphyrins fluoresce. So, I guess a #4 Wratten filter will work. Thanks again.