The Manual Lens Mount Adapter Compatible for M39 Lens to Canon RF Camera Body from Urth makes it possible to explore new lens and camera body combinations. It is made of meticulously machined aluminum for a snug, light-sealed, and secure connection. Electronic communications and automatic functions are not supported with this adapter, focus and exposure settings may be manually adjusted.
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I purchased the M39 to Canon RF adapter to use a Russian 40mm uncoated lens (that has been modified to western focal lengths) with my Canon RF. I also purchased a Voigtlander 28mm M39 mount lens for my Bernback Leica. I'm enjoying using both lenses with my Canon and Leica. The quality is fantastic and the fit is perfect with no light leaks. Measurements are accurate. A wonderful product to expand your use of classic screw mount lenses with modern Canon RF mount bodies.
[This review was collected as part of a promotion.] I once bought an M39 adapter for my EF fitted camera and could only use my Jupiter (and other lenses) from a 50mm distance to the subject. Fun for insects but not much for portraits.Now, with my Urth M39 to RF adapter, I witnessed the beauty that is the bokeh of the Jupiter for the first time on infinity focus and I’m stoked!!!The Urth products look slick, feel well and work even better. And the fact that they help you help the planet is a very nice big bonus to that!