I have a beautiful Wollensack 75mm/f4 C-mount Raptar 3 inch (75mm)/f 4 lens for sale or trade. I have been using some C-mount lenses because I am looking for lenses that vignette. This one doesn't so I'm looking to trade for a C-mount lens that does vignette, the more the better. The Wollensack is nicely built, in excellent condition. And you can see how small it is compared to the Lumix 20mm/f1.7. All controls work smoothly and glass is clean with a few tiny specs of internal dust. Includes original Wollensack rubber front lens cover. For sale for $155 which includes PayPal and USA shipping or will trade for another C-mount lens that vignettes. Sample pics show lens handheld at f8 (hummingbird feeder #741) and f4 (picture of face #743) and f8 (picture of face #742).