Most F mount lenses will fit the FTZ and FTZ II adapters, although there are exceptions. The K rings are very tight, and I haven't attempted to force them on. Pre-AI lenses from prior to 1977 will generally fit, but the very oldest Nikkors may not mount.
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| Nikkor-S Auto 5cm f/2 (Pre-AI) with deep aperture ring |
Nikkors with deep or long aperture rings, which date to about 1959 and 1960, will almost mount on the FTZ adapters. The aperture ring bumps into the housing around the F mount on the adapter, with perhaps a millimeter of missing clearance. The aperture ring on the Nikkor-S 5cm f/2 is easy to fix, but not from a collector's standpoint. The threaded hole on the ring, seen above, takes a set screw that engages the diaphragm. With the screw removed, the aperture ring can be unscrewed with several turns and is ready for retooling.
“Retooling…I’ll retool you!”
Frank Shirley
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| Nikkor-S Auto 5cm f/2 (Pre-AI) with shortened aperture ring |
With the aperture ring removed, the lens is mountable on the FTZ. This is worth testing, just to make sure the bayonet pieces and any other protruding elements have space. A few minutes with a rotary tool or disc sander (the disc sander worked beautifully) will reduce the length of the aperture ring. With the aperture ring reattached, there are no issues mounting the lens to the FTZ adapter.
