Ultra-wide prime lens for Sony E-mount APS-C cameras.
The Carl Zeiss Touit 12mm f/2.8 is a native autofocus wide-angle prime for the Sony E mount (APS-C), produced under the Zeiss Touit brand for mirrorless camera systems. The Touit series was designed specifically for mirrorless cameras, featuring a shorter flange distance and smaller physical profile than Zeiss's SLR designs.
12mm focal length (18mm full-frame equivalent on APS-C), f/2.8 maximum aperture, Carl Zeiss T* coating, autofocus, Sony E mount (APS-C), 67mm filter thread.
The Touit 12mm f/2.8 provides a very wide angle of view for APS-C Sony cameras with autofocus capability — a practical advantage over adapted manual-focus wide-angle alternatives. Zeiss T* coating delivers good flare control. The 18mm equivalent is useful for landscape and architectural photography. Image quality is excellent for an autofocus wide-angle in this price tier.
Test autofocus accuracy and speed on a compatible Sony E APS-C body. Inspect for fungus, haze, and T* coating condition. Confirm Sony E mount engagement. Check aperture ring if present or confirm aperture control via body.