Steinheil-Cassar 105mm f4.5 -- This is a very interesting lens. At its minimum focus distance, the lens almost becomes a soft focus lens with very nice glow. Perfect for glamorous shots. But, once the lens is focused near infinity, the soft effect goes away and becomes normal lens.
At minimum focus distance. Note the soft effect.
At normal focus distance. Remember that many folder lenses have their own focus mechanism and I mount them on a focusing helicoid so even if the lens itself is focused to infinity, I can still focus them pretty close with the helicoid.
Rodenstock Heligon 50mm f2.0 (Red A version) -- Another favourite. This lens usually came with the Kodak Retina cameras as a higher end lens than the normal Schneider-Kreuznach Retina-Xenon version. Tiny and yet beautifully built. Image quality is as excellent, as is the delicious bokeh. Both pictures below were shot at f2.
More to come...