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The Minolta SR-mount was the bayonet mounting system used in all 35 mm SLR cameras made by Minolta with interchangeable manual focusing lenses. Several iterations of the mounting were produced over the decades, and as a result, the mount itself was sometimes referred to by the name of the corresponding lens generation (f.e. "MC", "MD" or "X-600") instead.
MC (1966): Lenses with automatic diaphragms, with the MC tab. MD (1977): Lenses with automatic diaphragms and the MC tab, and an additional minimum diaphragm (MD) tab to signal the minimum aperture opening size (largest f-stop value) of the lens to the body for shutter-priority autoexposure.
The semi-automatic diaphragm works in the same way, with a small exception: the aperture does not return to fully open until after the photographer winds the film on following the exposure. Other lenses have a manual pre-set or fully manual diaphragm. [3] Super-Canomatic R lenses are equipped with two diaphragm control rings.
The sequence of lens designations may differ in literature. See also full list of Nikon designations, Sigma designations, Tamron designations and Tokina designations.. Nikon AF-S/Sigma HSM/Tamron USD or PZD: The lens contains an integrated ultrasonic focus motor based on piezoelectricity, which enables quiet or low noise autofocus operation.
The centre of the diaphragm's aperture coincides with the optical axis of the lens system. Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris. See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the ...
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The first Minolta SLRs were marketed with SR- model numbers starting from 1958 with the Minolta SR-2, which featured semi-automatic diaphragm operation with Auto-Rokkor lenses: winding the film advance lever opened the diaphragm and cocked the shutter; when the shutter was released, the iris would stop down to the selected aperture.
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