with regards to the other thread on "portraiture" and focal length, i would like to clarify why it would matter.
let's just say you were @ 24mm, standing close to the subject.
@ 200mm, standing further from the subject but zooming in to get the same perspective.
will the 200mm still make the subject look more flattering?
another thing is about aperture values. i know a large aperture will give shallow DOF and vice versa.
Let's say i'm doing a product shot of a clothing on a hanger, against a wall. does it matter if i use f1.8 or f32?
another scenario i want to clarify is a controlled shot ( with tripod and lightings ) of a half body against a plain background, about 1.5m away from the subject. does it matter if i use f1.8 or f32?
in these two cases, we assume everything is at optimal values ( sufficient shutter speed/iso to prevent blurring ). any difference between the 2 aperture values?
lastly, a question on lenses. what are the differences between a 3rd party lens (say tamron ) vs original manufacturer ( say canon ) lens, assuming same specs? i'm using a 450d - would it be wiser to purchase a 2nd hand tamron or canon lens?
Thanks for reading!