I just bought a 135mm f4.5 lens for the Mamiya TLRs. It is black with a blue dot on the shutter release.
Looking at it from the back, the shutter is the last thing, ie no element to the rear of the shutter on the taking lens.
My other TLR lenses (all chrome versions) have a rear element behind the shutter.
Have I been sold an incomplete lens, or are there black versions of this lens where the shutter is behind all elements?