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1.1.2 M42 screw mount. ... Cameras using the M42 lens mount, also known as the Pentax screw mount. ... Compatible with all Pentax DSLRs
All Pentax K-mount auto-focus cameras are backward compatible with K-mount lenses dating back as far as 1975 without need for an adapter. Cameras with a "crippled K-Mount" cannot read the set f-stop of K and M series lenses and must stop-down momentarily to meter in case the adjusted aperture is a stopped down one.
The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.
Still the basis for Pentax lenses and cameras today, the K mount offered greater convenience and enabled the production of faster lenses such as the 50 mm f /1.2. [17] To keep M42 users in the Pentax system, an M42-K Mount adaptor was offered, enabling them to continue to use their existing lenses, albeit with the loss of automation and needing ...
Mamiya 645DF (Phase One 645DF) (2009) — digital-only (no film backs) supports Leaf shutter lenses, vertical grip and user firmware upgrades. Mamiya 645DF+ (Phase One 645DF+) (2012-current) — Faster auto focus compared to DF and automated live view handling with compatible digital backs.
The Micro Four Thirds system (MFT) of still and video cameras and lenses was released by Olympus and Panasonic in 2008; lenses built for MFT use a flange focal distance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13.0 mm (21.6 mm diagonal).