Originally posted by JohnBee Originally posted by Goslett: I'm sure there's already a thread like this but I can't find it. Looking for a lens for an upcoming book of portraits I'm doing, looking for some recommendations.
Manual or auto?
Manual or auto? Long or short? Costly or cheap? Fast or slow? Sharp or soft? Color or B&W? Clumsy or easy? Imposing or discreet? Straight or distorted? Posed or spontaneous? Ambient or artificial light? So many decision points...
A 50mm lens on an APS-C sensor will fill the frame with head shots at 3-4 feet, full-body shots at 10-12 feet. With an 85mm, those become 5-7 feet (head) and 17-20 feet (body). With a 35mm, those become 2-3 feet (too close?) and 5-7 feet (body). This isn't theoretical; I just now put those lenses on my K20D and paced the distances.
The right focal length depends on your comfort zone, distance-wise. If you and your subjects are comfortable at around 6 feet, use a 35mm for bodies and an 85mm for heads. If the comfort zone is thicker, use a 50-55mm for everything. Fast manual 50's and 55's are still incredibly cheap; my recent Yashinon-DX 50/1.7 and Chinon 55/1.7 cost less than US$15, shipped, combined, total.
For controlled settings, like lit studio spaces, auto-focus and -aperture are irrelevant. Fast lenses can take you from soft to sharp by stopping-down. Slow lenses start sharp and stay there. (Try an Industar 50/3.5 or a Macro-Takumar 50/4, eh?) Old old MF and LF lenses (on bellows) can give unique renderings. Fast AF zooms give flexibility. So many options...