SIRUI Aurora 35mm F1.4 Full-Frame Autofocus Lens for Sony E

The f/1.4 aperture allows for excellent performance in low-light conditions by letting in more light, and it enables the creation of a shallow depth of field, resulting in beautiful background blur (bokeh) to make your subject stand out.

Yes, the lens features an STM autofocus motor that provides smooth, quiet, and accurate focusing, which is ideal for video. It also supports features like Eye-AF and subject tracking, and the IRIS LOCK button prevents accidental aperture changes during recording.

Full-frame means the lens is designed to cover the entire sensor of a full-frame camera (like Sony's Alpha series full-frame models), providing its native 35mm field of view. It can also be used on APS-C sensor cameras, where it will have a narrower field of view.

The SIRUI Aurora 35mm F1.4 lens is relatively lightweight, weighing approximately 490g (1.08 lbs).

This specific model is for Sony E-mount. Sirui offers the Aurora 35mm F1.4 in other mounts, such as Nikon Z, L-Mount, and Fujifilm X Mount, if you use a different camera system.

The fluorine coating is hydrophobic and oleophobic, meaning it repels water, oil, and fingerprints. This makes the front element easier to clean and less prone to smudges, which is beneficial for maintaining image clarity.

The FN (Function) button is customizable and can be programmed through your camera's menu to perform various quick functions, such as changing AF modes, activating focus peaking, or adjusting exposure compensation, depending on camera compatibility.

Ensure your camera's autofocus mode is set appropriately (e.g., Continuous AF for video, Single AF for stills). Check that firmware for both the lens and camera is up to date. Clean the lens contacts on both the lens and camera mount.

Verify that the lens is correctly focused on the intended subject. Check if the camera's autofocus settings are accurate. Ensure the aperture is not set too wide (e.g., f/1.4) if extreme depth of field is not desired, or conversely, ensure it's wide enough for low light. Check for smudges on the front element.

Remove and reattach the lens, ensuring it clicks firmly into place. Clean the electrical contacts on both the lens mount and the camera mount with a dry, lint-free cloth. Try the lens on another compatible camera body to isolate the issue.

Avoid forcing the focus ring. Check if the AF/MF switch is set to AF; if so, switch it to MF. If the issue persists, it may require professional inspection.