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2

The control ring is a third ring on the lens in addition to the zoom and focus rings (of course primes lack the zoom ring so they have only two rings: focus and control). The control ring typically has clicked positions, so it adjusts some camera parameter in steps. As a cost reduction measure, the RF 24-240mm superzoom lens has focus and control ring ...


3

Sigma is primarily known as a third-party lens manufacturer—they make lenses for several different camera mounts. For instance, the Sigma 28–200mm ƒ/3.5–5.6 Aspherical IF Macro that you're asking about was available in at least the following mounts: Canon EF, Nikon F, Pentax K, Sony / Minolta A, Sigma. You can only mount the Nikon-mount version of the Sigma ...


0

I'm pretty sure it's not Pentax K (PK) mount. It might be Nikon F (NF) mount. All of the control and communication linkages are missing, but the page you link seems to indicate this is normal for that lens. The alignment dot has the same position as NF. The locking slots are located between the flanges, like NF. The slot would adjacent to one of the ...


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