A lot has been said as to the relative merits of different makes of lenses so I can only tell you that my experience is that they are much the same in quality so long as you stick to five or six element optics. These would be tha el nikkors, componons ( not comparon) or rodagons. I use all three and find no difference of any note. I am not positive but the N on the nikkors probably just means normal focal length as in 80mm for 6x6 cm or 50mm for 35mm. Hope this helps!