X-RAY & Red Filter

[Andrew O'Neill]

 

[koraks]

Looking at the examples, I have to be honest in saying that I find the differences in tonal relationships quite minimal. Especially the 'cloudy sky' images show very little effect of the filters. The red toolbox also suggests that there's not as much happening in the red channel as you might guess at first glance.

I bet that a lot of the 'red' exposure happens in the tailing part of the sensitivity of the x-ray film in the yellow part of the spectrum up to 600nm combined with the imperfect filter characteristic of the red filter, which will still allow a tiny bit of shorter wavelengths to pass. The result is that it's not all that different from a yellow or orange filter - just a whole lot more dense, so much, much longer exposure times.

 

[pentaxuser]

I agree with your conclusions, Andrew. Difficult to do otherwise when you show the evidence

I can see your backing group making a reasonable stab at a more laid back modern version of High Noon

pentaxuser

 

[Sirius Glass]

Fascinating to see what you can get with red filters from films not designed to be sensitive to infrared.