It features an all-metal lens barrel construction, a 39 mm Leica compatible L screw-mount and a 10 bladed aperture (which creates very pleasing out-of

It features an all-metal lens barrel construction, a 39 mm Leica compatible L screw-mount and a 10 bladed aperture (which creates very pleasing out-of-focus highlights). Unlike its wider-angle counterparts, the Ultron 35mm lens incorporates a rangefinder calibrated rear-focus helicoid, which makes it easier to focus with classic rangefinder cameras from Leica, Contax and Canon. All lenses have a “click-stop” on the aperture movement at half-stop intervals making subtle adjustments in exposure or depth-of-field easy.