UVA Filter Kodak Wratten HELP for SCIENCE

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?

Quote:

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Originally Posted by 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?

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Wratten #4 is a yellow filter that allows only yellow (in a curve) to pass through.

I think you need a film camera for an honest result. DSLRs are a horse of a different color, no pun intended.
http://www.digital-photography-schoo...ters-for-dslrs

Quote:

---

Originally Posted by 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?

---

The key is which film was used. B&W film was used for a long time as color film very costly until the mid 1950's. Then Color film was very conman and just before the Digital camera took over B&W film was very costly. Since most fluorescence was white light B&W film with the yellow filter killed all UV light.

I have a near UV leaser pointer, on CRT the blue dot becomes a big white dot.