Use of X-ray film: technical discussion with example images

Why cyan an not green?

Blue skies

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Originally Posted by Eugen Mezei

Why cyan an not green?

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But you cut the blue away with the yellow filter you put on the taking lens.

Btw, where can one buy cyan filters?

Show and tell please
I don’t use filters

Quote:

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Originally Posted by Eugen Mezei

But you cut the blue away with the yellow filter you put on the taking lens.

Btw, where can one buy cyan filters?

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Eugen

Do you only do research?

I just reviewed your posts to 2013

Your language seems to be american english

I see you bought some x-Ray a while back

Did you try it?

Quote:

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Originally Posted by Eugen Mezei

But you cut the blue away with the yellow filter you put on the taking lens.

Btw, where can one buy cyan filters?

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The idea behind using a cyan filter on the meter would be to make the meter “see” more like the film does. Loosely speaking, an orthochromatic film can’t see red light, so if the meter can’t see red light either, it might give more useful exposure readings for the film. It’s not going to work perfectly but anyway. A cyan filter such as the Wratten 44A (“minus red”) would be one to try. This assumes no filter on the taking lens.

If you use a yellow filter on the taking lens, to attenuate blue, you’re effectively using mostly green light to expose the film, in which case a green filter on the meter would better approximate how the film sees.

These will only be approximate adjustments due to the inherent differences in spectral sensitivities of the meter and film. Obviously the specific filter used on the taking lens will affect this.

Well done Michael R

Eugen, ask him questions

Thank you both

Michael, that is exactly what I meant. Thank you for explaining it better. Also thanks for mentioning the minus red filter, I will look out for one.

Tin Can: Nope, my English is not american. It is just bad. Where are you from? I bought a lot of X-ray from German Ebay.

I am from the middle of USA, Chicago

Moved often since child

I bought only from https://www.zzmedical.com/x-ray-acce...-ray-film.html

I experiment more than some members like

rules are to be broken

If you want slightly darker blue sky, or better separation between cloud and sky, with green latitude x-ray film, use a yellow filter. The strongest I have used is a #15.