Doug...good stuff! Is that the Leitz f/6.8?
It's the Novoflex T-Noflexar. The Leitz f/6.8 has better color saturation and a curved field. The T-Noflexar's not bad for its age; I bought it because my Leitz 560mm f/6.8 is the version made for Novoflex so adding the 400 to the kit is just the lens head - not a lot of extra bulk, weight or $$$.
EDIT: It's not just mirror lenses that have distinctive optical signatures. Simple refractive lenses like the T-Noflexar and the Leitz f/6.8 lenses have distinctive optical signatures too, and whether its objectionable or not depends on the nature of the image and the tastes of the viewer. The most common artifact of these lenses results from what I believe is spherochromatic abberation, which can be seen as magenta or green fringes, most clearly on out-of-focus points of light or other out-of-focus high-contrast edges. Note the grasses in the upper part of this photo made with the Leitz 560mm f/6.8 (this is an extreme crop):
The mega-$$$$ lenses shouldn't show these artifacts.
