Low Breathing Effect and Manual Lens: By improving the lens structure design, the cinema lens has a good control of the breathing effect, which can reduce the focus when shooting. This is a manual lens, you need to enable M Mode in the camera settings to turn on the Shutter release without lens feature. 270° Ultra Long Focusing Stroke: Stepless focusing gear design, ultra long 270° focusing stroke, can be adapted to various follow focus devices, can focus accurately during the shooting process, and make the focus movement more delicate. Changing Lenses Takes Ten Seconds: The size, length and diameter are almost the same, and the positions of the focus ring and aperture ring are the same. It is guaranteed that when using this series of cinema lenses, the accessories do not need to be reinstalled, and the stabilizer does not need too much balance adjustment. All Metal Material: The use of sturdy all metal material ensures that the optical components inside the lens will not be damaged by daily small scratches and use in harsh environments. Stepless Aperture T1.05 Large Aperture: Stepless aperture design, equipped with imprint slide mode, to ensure that the video screen exposure is silky and excessive, T1.05 aperture, can maintain high image quality in low light and low illumination environments.