The greatest liability will be for shooting video, though if you capture your audio separately, it won’t be an issue. You will notice it it a bit while shooting stills with the lens the first few times, but it will quickly blend into the white noise as it isn’t very loud. There is a quiet clicking that can be heard while focus changes are made, but it is loud enough that the on-camera microphone will pick it up. I’d like to see Sigma explore that possibility in the future, as while the focus quality is pretty good here, it’s not as smooth, quiet, and refined as I’ve come to expect in the best lenses and isn’t quite at the level of 85mm F1.4 DN I recently tested from them. These give the required torque, but keep things “mirrorless” (read: smooth and quiet). Most premium mirrorless lenses that I’ve seen have elected for multiple linear stepping motors (I’ve seen even triple and quad motors in a few lenses). The strength of “HSM” is high torque and speed, but at the cost of some smoothness and quietness. Sigma has clearly determined that their more typical stepping motors in some of these mirrorless options did not have enough torque for this application, so they’ve gone with a ring-type hypersonic motor. That’s a designation I’m more accustomed to seeing in Sigma’s DSLR releases, and it does explain a few things. Interestingly, Sigma indicates that they have employed a “Hypersonic” AF motor in this lens. I got this macro shot at 1/8th second in poor light handheld with the a9II and 105M, which is pretty impressive. With the a9II, I would say my stability results came close to what I saw with the Sony 90G Macro, but I felt I needed to keep shutter speeds up a bit more with my older bodies. In fact, I found that I got better stabilization results with the newer Sony a9II that I happened to be testing at the same time when the 105M was attached than my slightly older a9 or a7RIII bodies. Today that’s no longer the case, and the new 105M is designed for Sony FE and Leica L – two systems where most of the cameras have IBIS. At that point, however, the idea of in-body-image-stabilization (IBIS) was still a future invention, so in-lens stabilization was the only path to stabilizing the lens. That’s a bit surprising, mostly because the 2012 105mm F2.8 Macro did have OS (Optical Stabilizer). One core distinction between the lenses, however, is that one (the Sony) is stabilized while the Sigma is not. We will explore both those strengths and weaknesses as a part of this review today.
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