Efke Ortho, Ilford Ortho and x-ray films are all orthochromatic. I use all of them, mostly x-ray because of cost. Overall I estimate I use 10-15 times as much Ortho as Pan films. The built in contrast is great for my alt processes. I do not us it for female portraits, or outdoors with lots of sky, but other than those no limitations.
In the 1930's when I was first learning to photograph and process images, a large majority of available films were orthochromatic. I wish I could find some of the magazine articles discussing pros and cons of ortho vs "Those new pan" films. They would open a lot of eyes in today's photographic world. I won't be surprised if some manufacturer comes out with one of those digital things that is blind to red, orthochromatic ta tis.
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