Minolta Auto Tele Rokkor PF 100mm F2.0 – History, Disassembly, Cleaning and Impressions
Recently, I have the very good fortune of acquiring a complete set of an extremely rare vintage Minolta Auto Tele Rokkor PF 100mm F2.0 lens. From the patchy sources of information that I found, this lens was introduced on 25th Feb 1961 for the Minolta SR series manual cameras. Featuring 6 elements in 5 groups, with 7 aperture blades, this lens weighs 425g and is pretty compact for a fast portrait lens, about the size of your Sony 18-55mm kit lens. This lens was updated in 1966 with an MC tab for the Minolta SRT series. Production of this lens ended in 1968 due to the difficulty and high costs involved in making this lens. Accordingly, there were not many copies of this lens made, contributing to their rarity. The successor to this lens was the Minolta MC Rokkor PF 100mm F2.5, which is another legendary portrait lens. Minolta never made another 100mm F2.0 lens until 1987 where the Minolta AF 100mm F2.0 was introduced, which is a completely different lens to the Rokkor 100mm F2.0.
The Minolta Auto Tele Rokkor PF 100mm F2.0 Package. If you look carefully at the box, you would find that the lens formula description was actually printed wrongly. It should be PF and not FP. I wonder if this printing error actually makes it even more valuable, much like printing errors in stamps and dollar notes. I have never seen another intact box for this lens so I have no idea if this error was widespread or just for a limited number of lenses.
The lens itself. Click-stops are all single stop, no half-stops.
A piece of Minolta history
Unfortunately, this wonderful lens has a lot of oil gumming up the aperture blades when I got it. The aperture control ring was unable to open and close the lens diaphragm properly.