<p>I started with two Nikkor lenses on an FM2n, a 24mm AIS and a 50mm AIS (both very fine lenses, by the way, probably better than the AF-S versions that I also have), and used them for a couple years. When I bought an F4s, I purchased the AF-S D Nikkor 20mm/2.8, 24mm/2.8, 50mm/1.8 and 85mm/1.4 lenses. I found myself using the 24mm and 85mm the most. I tend to prefer wide-angle, but never owned a 28mm lens. I'm surprised that there isn't more mention of 24mm here, but I guess that's due to this being a rangefinder forum, and 28mm is a very popular popular focal length in pretty much all systems, while I rarely see 24mm used with rangefinders. I rarely use a 50mm lens, and probably use the 20mm more. I find ways to use the Nikkor 85mm/1.4 due to it's amazing optical quality... what a lens. Not using it would be a crime.<br /> So, if I were to use a single lens with my Nikon system, I'd take the 24mm lens.<br /> My choice for a single lens on a Leica body would be a 28mm lens. <br /> BTW, I don't have strong enough curse words for zoom lenses on film cameras. I never use them.</p>