Sigma Cine High Speed Zoom Lens Kit - Sony Mount

An F-stop is a calculated measurement of aperture, while a T-stop (Transmission stop) is a measured amount of light that passes through the lens to the sensor. T-stops are considered more accurate for cinematography as they account for light loss within the lens elements, ensuring consistent exposure.

These lenses are designed for Super 35mm format. They may cover full-frame sensors but will likely exhibit significant vignetting (darkened corners) at wider focal lengths and apertures. They are best used with Super 35mm shooting modes on full-frame cameras or on dedicated Super 35mm bodies.

Yes, both lenses have a standardized 82mm filter thread on the front, allowing you to attach standard screw-in filters.

First, use a rocket blower or air puffer to remove loose dust. For stubborn marks, apply a specialized lens cleaning fluid to a microfiber lens cloth (never directly onto the lens) and gently wipe the element in a circular motion from the center outwards.

Please refer to Sigma's official warranty documentation for the specific warranty period and terms applicable in your region.

No, these are manual cine lenses and do not feature optical image stabilization. Stabilization would typically be handled by the camera body (if available) or via external stabilization systems like gimbals or tripods.

By maintaining consistent color rendition across the zoom range and between the two lenses, it significantly reduces the time and effort required in post-production color grading to match shots filmed with different lenses or focal lengths.

Ensure the lens and camera mounts are clean. Verify you are using the correct E-mount version and that no obstructions are present in the camera mount.

Ensure the lens is properly focused using the manual focus ring. Check that the aperture is set correctly and that the camera's focus mode is set to manual.

This is a constant T-stop lens, so exposure should remain consistent. If changes occur, check camera settings and ensure no automatic exposure adjustments are active.

Ensure no debris is on the rings. Avoid applying excessive force. If stiffness persists, contact customer support as extreme temperature changes can sometimes affect lubrication.

This is expected if using Super 35mm lenses on a full-frame camera without crop mode. Ensure you are using the appropriate camera settings for your lens coverage or accept the vignetting.