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- Phil Olenick
Just got the new Sigma RF-S 18-50mm f/2.8 DC DN, the first Canon-licensed third-party AF/AE lens. It's a fast lens about as sharp as the EF 24-70mm f/2.8L USM, but nearly the same size and weight as the 10 oz RF-S 18-150mm kit lens.
Just one gumption trap - its Manual Focus ring is actually an unlabeled combined Focus/Control ring like on Canon's smallest primes, and doesn't have a Focus/Control switch on the lens.
So if your camera is set up to use Focus/Control rings as Control Rings, you won't be able to manually focus this lens.
Mine was set up that way so I could use the ones on my compact RF primes as f/stop rings. I later decided to disable Control Rings because the ones on my EF adapter were too easily jostled. As a result, what looked like a Focus ring on this lens did absolutely nothing until I went to the last page on the Focus tab in my R7's menu and set "Focus/Control" to "Focus." Then it worked to focus the lens.
I found that Control Ring being set to Off on another page doesn't disable manual focusing. It only disables the Control function, not the ring itself.
Just one gumption trap - its Manual Focus ring is actually an unlabeled combined Focus/Control ring like on Canon's smallest primes, and doesn't have a Focus/Control switch on the lens.
So if your camera is set up to use Focus/Control rings as Control Rings, you won't be able to manually focus this lens.
Mine was set up that way so I could use the ones on my compact RF primes as f/stop rings. I later decided to disable Control Rings because the ones on my EF adapter were too easily jostled. As a result, what looked like a Focus ring on this lens did absolutely nothing until I went to the last page on the Focus tab in my R7's menu and set "Focus/Control" to "Focus." Then it worked to focus the lens.
I found that Control Ring being set to Off on another page doesn't disable manual focusing. It only disables the Control function, not the ring itself.
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