Ultra high resolution is interesting when you can shoot with an excellent lens wide or almost wide open. Going down in aperture the resolution went down quickly. All micro films have a problem in high contrast light situations. Good results I had with the Rollei Retro 80s E.I. 50 with different developers. For a cubical type film the grain is extremely small. Recommended and available in 135-36, 30,5m/100ft and 120 roll film.