Interesting...using astia 120 blank film creates "infrared" effects?

[DanielStone]

hey guys,

I got some film back from the lab the other day, some Astia(RAP) in 120. One roll was 1/2 blank(black), but I noticed that the film base wasn't completely black, or in better words, seemed "thinner" in density compared to Velvia or my E100G film bases.

IDK what caused me to do so, but I took the 1/2 roll of unexposed black(developed ) film, and looked out the window. To my surprise, it caused the green trees to go almsot full magenta! To my eye, it reminded me of infrared effects in color photography. I've never shot color infrared(digital or analog), but having seen a lot of slides, it can give pretty cool results!

here's some examples(sorry, taken with my digital camera), the "filtered" shots are not sharp(as sharp as the unfiltered shot), but you can see the effects.

just wanted to share my experience, has anyone ever tried this? My rolls of E100G and Provia(and a roll of Velvia 50, all in 120 format) didn't produce the same results as the Astia. Interesting...

"fully filtered, uncolorbalanced in PS":

"straight shot" right out of the camera:

"white balanced in PS, filtered with Astia":

-Dan

 

[ath]

Unexposed but developed E6 film is an infrared filter. For b/w infrared with surveillance films I have used a piece of Astia as filter before I bought a proper one.

 

[Robert Hall]

One can also use 2 linear polarizers together, rotated until no visible light comes through and use that as an ir filter as well.

 

[michaelbsc]

Does the IR wavelength pass through the polarizing filter unaffected?

 

[Newt_on_Swings]

Not sure if its possible, I guess It depends on the brands of the polarizers, Ive done this long ago in the past to make a vari-nd filter but not for IR, and I got a very strong blue shift with mine at the end.

 

[Robert Hall]

Does the IR wavelength pass through the polarizing filter unaffected?

I'm sure you could find brands out there that this doesn't work with but I think for the most part, it would be many of them. You could always give it a test.

 

[ntenny]

Unexposed but developed E6 film is an infrared filter. For b/w infrared with surveillance films I have used a piece of Astia as filter before I bought a proper one.

Is it roughly equivalent to an 89B/R72 filter, or closer to a deeper-infrared filter like a Wratten 87?

-NT

 

[holmburgers]

Daniel, very cool effect and hooray for hare-brained experimentation!

There's no IR going on here, seeing as he noticed it first visually. Happy coincidence?