I am looking for a 35mm format Nikon lens, preferably manual focus. A search of the archives uncovered several candidates, but, perhaps, a better option may be suggested. This is to be used for primarily technical/scientific purposes and not general picture taking or photography, so the exact focal length (35-50-85-105mm all fine) does not matter as long as the following criteria are met: 1. reasonably sharp, but, importantly, uniformly sharp over the entire negative, including edges and no softness in the corners; 2. can be a slow lens, but must have zero shape distortions of any kind, including no distortions around the edges; 3. has to have at least one aperture that has zero light fall off or vignetting, and this aperture does not have to be fast; 4. must maintain these properties when focused at oo through 1 or 2 meters, with close focusing a plus, but, not an absolute requirement; 5. must maintain these properties when used with either B&W or slide film; 6. must be durable enough to survive time lapse photography, i.e. hundreds of continuous aperture activations at 3.5 fps with no focus creep or unexplained image quality variance from picture or picture; 7. must be reasonably available, i.e., not one-off ancient museum glass, and compatible with AI or AIS (better) mount. Thank you!