I've been a yearlong owner of a Nikon D40 but just recently upgraded to a D90 (my hobby time or skills isn't serious enough yet to upgrade to a full frame unit) and I'm a Nikon loyalist, so no Canon comments please.
Currently i'm using an Tamron 18-50mm f2.8 and 18-250 f3.6 lenses as my general purpose ones, and I am shopping for an ultrawide, at least one decent prime lens and eventually a serious fast telephoto for wildlife and sports shooting.
So i'm browsing on amazon.com and check out two different Nikon primes, a Nikkor 50mm f1.8
and a Nikon DX 35mm f1.8 (autofocus motor built in, so it'll also be compatible on my D40 in case i use it again)
so yeah I know the 50mm will be the equivalent of 75mm on a full frame and 35mm will be scaled up approx to a 50mm,
I intend to use this primes for mostly indoor and outdoor people portait shooting. I don't know what else off the top of my head but i wonder, esp when shooting in enclosed rooms, wether the 35 or 50 will be more convinient, esp if I shoot in cramped spaces.
Also other prime lens users, what other kinds of shots do you use prime lenses for? Outdoor action? Nature? Indoor objects?