Originally posted by SherryO My instructor suggested the 60 to 90mm range, but she has a film camera and I'm now thinking she isn't familier enough with digital to know that a 50mm is comparable.
totally. The 60-90 range is perfect for portraiture on film.
Now here is where it gets annoying and all strange... one would be lead to believe that a 50mm lens magically becomes a 75mm lens when you slap it onto a Pentax DSLR. Sure the field of view becomes similar, but its not that simple. A 50mm lens will always render like a 50mm lens, no matter what camera it's mounted to. This means that wide angle lenses which are known for distorting things and make faces appear wider will still do that. a 50mm lens is heralded as the standard lens because it renders closer to the human eye than other lenses. On a film body this would also give you a field of view pretty close to your own...but on an APS-C it "zooms in". A lens in the 60-90 range would in term make faces seem thinner.
Its an odd world we live in with so many different formats. but you can't go wrong with any lens from 50-90mm for what your looking to do.
Now, I'm going to overload you here with junk...
The shorter the lens the further back you throw the back ground. This is a fun one I like using, take a photo of your subject with your zoom lens on it's widest setting. Then, keeping the subject the same size, take it again at the opposite end of the zoom range. Look what happens to your backdrop. This is a fun trick.