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Anonymous
Multiply whatever the true length- this is what will be on the lens- is by 1.5 and you have the 35mm equivalent for your camera.
Yes, a 35mm lens is the closest you can get to a 50mm equivalent on your camera, but most people seem to prefer wider normals: 30mm or 28mm, and 28mm is almost exactly the perfect "true normal." (A normal lens is one that makes the scene look like it does to human vision.) But pick the one you like and stick with it.
You can do portraits at any focal length- the best one I ever shot was taken at a wide 36mm equivalent- but there's some considered good for it. These are normals (the 28/30/35 discussed above, and all 40-60mm equivalents) and medium telephotos (61-135mm equivalent). These are good because wider or longer lenses tend to distort the face some. Longer lenses are considered more flattering because they flatten the face, and really long ones are often used for fashion photography. Shorter lenses expand it- for instance, making someone's nose pop out. The traditional balance for "a portrait lens" is in the ~80-~90mm equivalent range, though any MT will do just fine. I use a normal for most of my portraits, FWIW.
Also, good photo in the OP.
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