- This lens mount adapter allows a M42 Universal Screw Mount Lens to fit on Sigma SA SD camera bodies. - Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. - In this case "stop-down mode" will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body. - This adapter does not have correction glass inside the adapter, which will not alter the original optical quality of the lens. - Infinity focus is guaranteed. Compatible: - Lens: M42 mount lens (Carl Zeiss, Pentax, Praktica, Mamiya, Zenith) - Camera: Sigma SD7 SD9 SD10 SD14 SA series.
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