This sample circa '69.
Filter size: 72mm
Close focus: 13 feet/4 meters
Aperture range: f/4.5 - f/32
Aperture blades: 6
Depth of field scale for f/11, f/22, IR index.
Design: 6 elements in 5 groups
Comments: Note there is an earlier 5-element version which looks the same, just with a P instead of an H. I was pleasantly surprised by this lens - it seems like a pretty solid performer, at least for black and white use. The lens is pretty big and hefty, and my sample is rather beat-up externally.
Here are the two 300mm lenses side by side:
The Nippon Kogaku and Nikon versions pretty much look the same.
Oddly this lens was never made in a C version.
The K verion and AI only differ cosmetically. The last AI-S version does focus a little closer, to 3.5 meters (but you should get the ED-IF version which focuses to 2.5 meters). It seems strange the design lasted so long, and that it was never upgraded to 7 aperture blades.
More information:
Ken Rockwell
Brochure
Another brochure
Example photographs:
More photos from this lens
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