This is part I of a series of what glass you will need. Each part will discuss a certain lens type and its applications
Standard prime lenses had been the base of each SLR equipment since the earliest days. Virtually all SLR were sold in a kit with a 50mm f/1.8 and many of us never used anything else. In range-finder world the slightly wider 35mm was the standard.
It is said that a 50mm would give you a field of view similar to our vision (I stick with the FX convention for FOV<->focal-length, for DX divide by 1.5). This is somewhat true. Our field of vision is much wider, but the zone where we see sharp much narrower. I think the main reason for the “nifty-fitfties” is that they are the widest lenses with a still rather simple design: The focal length is larger than the flange distance.
So do you need it and what do you expect from it.