Voigtlander Super Wide Heliar 15mm f4.5 Aspherical cover The smooth-turning aperture control ring

The smooth-turning aperture control ring can be used for stepless aperture adjustment with any lens

This first series of Pentax K-mount lenses is larger and more heavily built than the later Pentax-M lenses

but this is also the right size for a 35mm rangefinder or a small SLR

It's machined from solid aluminum

Canon 28mm f2

Voigtlander Super Wide Heliar 15mm f4.5 Aspherical cover The smooth-turning aperture control ringThe Voigtlander Super Wide Heliar 15mm f4. 5 Aspherical is a surprisingly small full frame ultrawide lens for Leica M mount. Clean glass, smooth focusing, good diaphragm, and full rangefinder coupling for precision focusing. With original box.