I have recently taken posession of my father's camera collection. Included are a couple of Nikon Fs with four lenses but no lens caps. The lenses are 50mm f1.4, 35mm f2.8, 105mm f2.5 and 200mm f4. Al pre AI (I think) and marked Nippon Kogaku. I think they are all 52mm filter thread. I have some more modern lens caps but would like to know what the originals would have looked like so I can buy some. Were they an older version of the sprung cap or just a simple push on cap? Steve.