Connect your favorite manual Pentax K lenses to your Ribcage with this C-Mount adapter. Fully automatic lenses can also be connected but please note that there is no electrical connection via C-Mount, so auto-focus and iris settings will not function. Fully automatic Pentax K lenses default to having the iris closed when used with this adapter, although it is possible to open it by taping the iris pin on the back of the lens. 35mm (full frame) lenses will experience a crop factor of 5.7 with the Ribcage.
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