RB67 65mm Lens Variations: Single Coated, NB and C
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Mamiya RB67 65mm Lens Variations. Although there were five different styles of RB67 65mm lenses (not counting the k/l version), these three variations showcase most of the physical differences. In photo one, the lens at the top is the early single coated style, lower left is the NB (new body?) and the lower right is the C version. You can see the amber reflection in the single coated version and the purple coating in the NB example and the purple/green reflection in the C multi coated lens.
Looking at photo two you can see how the NB and the C version are both floating element designs while the early lens to the left is not. A quick note on the NB version: it was introduced in 1974 with the new style lens, coating (appears to be multicoated) and body but with the old shutter. Later that year, the C lens was introduced with a new type of shutter and multicoating. The NB lenses are not that common having a fairly short production life.
