A custom lens control system and light filter



A custom lens control system and light filter

How to change depth of field at constant exposure.

 Simplified drawing of two camera lens apertures or iris. The left aperture has a small diameter. The right aperture has a larger diameter. An arrow connects the left aperture to the right aperture signifying a change in aperture diameter and therefore depth of field.

The iris is operated to vary depth of field.

 Simplified drawing of two light filters, each comprised of two polarizing filters. The left light filter is at maximum light transmission. The right light filter is at minimum light transmission. An arrow connects the left light filter to the right light filter signifying a change in light transmission to counteract the change in exposure caused by varying the aperture diameter.

A light filter keeps exposure constant.


Depth of field change blurs the background

Depth of field is manipulated by increasing or decreasing the diameter of the lens' iris. When the lens is focused on a foreground subject, the background will become blurry and go out of focus or vice versa become sharp.

However, by opening or closing the aperture more or less light hits the camera's digital sensor or film, affecting exposure.


a variable ND filter keeps the exposure constant

There are various ways of compensating for the change in exposure caused by a varying aperture size. Shutter speed and ISO sensitivity could be slaved to the iris but these methods cause distracting motion blur and sensor noise and can not be employed over a wide variety of different camera systems.

Cinefade uses a variable ND filter that sits inside a matte box in front of the camera lens and is slaved to the iris. This solution is compatible with any digital and film camera system and cinema lens. 



Full Cinefade set up

The custom Filter Tray fits inside a matte box and is connected to the custom cmotion Lens Control System. The system will work with any digital and film camera and cinema lens with a manual aperture and geared ring.

 Full Cinefade set up with cmotion Lens Control System connected to iris and variable ND light filter on Sony F55 camera


 Icon of two simplified cameras. A digital camera on top and an old film camera below.

Compatible with all cameras and cinema lenses.

Cinefade uses a light filter to compensate for the change in exposure rather than shutter speed or ISO compensation. The camera accessory is compatible with all film and digital cameras that use a cinema lens with manual aperture control

 Icon of a simplified lens scale marked in T-stops with a limiter on top signifying a maximum Cinefade range of five T-stops.

Any Cinefade range Up to 5 T-stops.

Cinefade is not limited by the camera's shutter or ISO capabilities. It is possible to to achieve a Cinefade of up to 5 T-stops within the lens' limits without any loss in quality or undesirable artifacts, such as unnatural motion blur or sensor noise.

 Icon of a simplified clock with two gear wheels on the dial, signifying the speed and ease of calibrating the Cinefade system.

Fast and easy set-up and calibration.

The custom cmotion software and custom Filter Tray work together to allow fast and easy calibration of lens and Filter Tray at the push of a button, as well as full control over the Cinefade via a slider on the hand unit.

 Icon of a simplified Siemens chart signifying the optical quality of the Cinefade system.

No loss in optical picture quality

Cinefade uses Formatt-Hitech polarizing filters to attenuate the light with no loss in optical picture quality up to 5+ stops stops of extinction. There are no undesirable artifacts, such as unnatural motion blur or sensor noise to worry about.



Rent Cinefade in Los Angeles, London and worldwide


Rent Cinefade in Los Angeles, London and worldwide

Our unique Services

We provide the novel camera accessory and optional on-set support, enabling your production to perform a Cinefade with your camera system.

We are based in London, UK and are able to travel worldwide.



 Two icons with a simplified drawing of a Lens Control System and a Light Filter next to each other with a plus sign between them. A third icon is greyed out on the far right with a simplified drawing of a camera and lens. Cinefade provides the Lens Control System and the light filter to work with the client's own camera and lens system.

Cinefade is ALSO available at Keslow Camera in Los Angeles and at Arri Rental in London