What is the meaning of focus by wire and fly by wire?įocus by wire: Let’s say you turn the focus ring to change focus from point A to B. Unfortunately for videographers and cinematographers, the Sigma 30mm f/1.4 DC HSM Art is set to focus by wire by default and has no option to switch it to fly by wire. The Sigma 30mm f/1.4 DC HSM Art ( Amazon, B&H) has a finite turn ring for its focus ring and can turn one way or the other to a finite degree. If you are considering this lens for a full frame sensor or other cinema camera, check out this article: It is designed to completely cover a sensor the size of 25.1mm x 16.7mm. The Sigma 30mm f/1.4 DC HSM Art ( Amazon, B&H) is an APS-C sensor lens. ![]() HSM refers to their ring-type hypersonic autofocus motor in that lens. So while the DC HSM will work with a APS-C mirrorless camera, with an adapter, a DC DN lens will communicate naturally with the camera than the DC HSM lens. Sigma claims that their DC DN lenses are designed specifically and exclusively for APS-C mirrorless cameras.
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