Nikkor-S 5cm 1:2 on a Nikkormat FTn
Today’s guest post by Benjamin Ang is on the Nikkor-S 5cm 1:2 lens (click on images for lager view):
History and Overview
Nikkor-S 5cm 1:2 lens
Released along side the Nikon F in 1959, the Nikkor-S 5cm f/2.0 was the first normal lens produced for the F-mount. It was quickly replaced by the Nikkor-H variant just 5 years later making it a bit of a difficult lens to find. While the 2 cousins resemble each other cosmetically, the ‘S’ has an optical formula of 7 elements – one more than that of the more ubiquitous ‘H’.
As can be seen, the 5cm is a good bit smaller than the 50/1.2 AIs: the other 50 I use frequently. It has the black and silver finish typical of early non-AI lenses and is similarly made exclusively of metal and glass. While not very dense, it feels solid and gives the impression of a serious piece of equipment. Its scalloped focus ring is precise with no play whatsoever, as is the aperture ring.
Notice the 9-bladed aperture on the 5cm; a unique point among slow 50s
Sadly, I dented the filter thread when I dropped my F3 awhile back. I brought it in to a Nikon Service Center but they informed me the metal was too thick for their technicians to straighten out (I thought that was kinda funny).
A closer look at the 9-bladed aperture. The rim is shiny due to the modifications
stated below. Also note the lack of screws, a norm for early F-mount lenses.
The earliest 5cms had 9 aperture blades, and came without ‘click stops’ relying instead on ‘tick marks’ on the aperture ring. These are considered extremely rare and fetch terribly inflated prices on the market (as do all other ‘tick mark’ lenses). Later on, the usual click stops were incorporated, followed by a shift to having 6 aperture blades. The optical formula remained the same for all versions. The version I have has 9 blades, but no ‘tick marks’.
To mount this on my D700, I had to thin down the aperture ring by just a bit, and remove the ‘rabbit ears’. In its current configuration, it doesn’t communicate with the camera and you need to dial in compensation when stopping down. I’m working on adding a prong to connect to the AI tab, but I shoot the lens wide open most of the time and it hasn’t been too much of a bother as it is. The latest versions don’t require any work on the aperture ring.
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