Portraits with Ortho film: red in the complexion darkens, making facial features more exaggerated, emphasized blemishes. Sometimes used for portraits of men. Tech Pan has extended red sensitivity, givng the opposite effect, reducing the effect of blemishes, sometimes so much that the skin looks pasty.(posted 8530 days ago)Ortho lightens foliage, closer to how the human eye sees it. While a filter with panchromatic can give similar results, it won't let you develop under a safelight, which you can do with ortho.
Also available is Ilford Ortho Plus, about speed 40 to 80 (mine tested at 50).