The Samsung NX mount flange distance is 25.5mm, so the C-mount thread would need to be deep inside the bayonet. However, infinity-focus C-M4/3 adapters are more common and cost even less than C-NEX adapters. The micro 4/3 standard mount, used by both Olympus and Panasonic, has a longer 20mm flange distance and a nearly 8mm narrower throat than the Sony mount, so things are a bit more cramped near the back of a mounted lens. The photo shows the Sony NEX 18-55mm kit lens and a 12mm C-mount lens in a C-NEX adapter. Fortunately, the bayonet is more than wide enough, and adapters allowing infinity focus can be had for under $20 on eBay. However, that means the C-mount flange must sit 0.5mm recessed within the throat of the E-mount bayonet to allow the full focus range. Of the cameras discussed here, the Sony NEX E-mount has the shortest flange distance at just 18mm (very different from the 44.5mm of Sony's A-mount DSLRs). Of course, adapted lenses will generally be manual focus and either completely manual or aperture-priority exposure with stop-down metering. Lenses vary, but 37.2mm of clear diameter at the flange surface seems to be a common design goal and narrower clear spaces might prevent some lenses from being fully screwed-in. There also is an issue with the "near thread" diameter of the lens barrel. They are designed to have a distance of 0.69 inches (17.5mm) between the mounting flange and the film/sensor surface. Update: the Pentax Q was announced on J- see the new "appendix" in step 6.Ĭ-mount lenses have a 1-inch-diameter thread with 32 threads per inch. The photo is an uncropped self-portrait (reflection in a mirror) of my Sony NEX-5 with a 12mm f/1.4 C-mount lens attached. The goal of this Instructable is to help you know what to expect from C-mount lenses before you buy them. Designed for a short flange distance and to cover a small image format, C-mount lenses often are physically tiny, let lots of light in, and can be found at very attractive prices.Īre C-mount lenses a viable alternative for use on relatively large-sensor compact mirrorless camera bodies using Olympus/Panasonic micro 4/3, Samsung NX, and Sony NEX E-mount ? There has been quite a run on C-mount lenses, especially fast ones around 25mm focal length, because many people expect them to be the micro 4/3 equivalent of a "fast fifty" normal lens - but there are issues. C-mount lenses were used on many movie film cameras and are still commonly used on video, security, and industrial digital cameras.
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