I recently shot a few portraits with my 4x5. half length, sitting, with the subject's hands resting on his legs. The hands look really huge in the prints. I used a 210mm lens, no camera movements, camera angled slightly downward. Is a 210mm too short for this? Can I correct this problem with camera movements? I was thinking I need a longer lens - 240 to 300 - but if movements will correct this, I'll put the money in film.
210 should be fine. The answer isn't in camera movements but in posing the hands.
The problem is that it's easy to make the hands look huge, and it's something one needs to pay attention to. If the hands are parallel to the lens plane, they tend to look large. Try angling the hands so they are in profile, and they'll look smaller and more natural.