A look at a Schneider Optics white frost filter on the ARRI Alexa camera.
Schneider Optics MPTV Black Frost filter test on the Arri Alexa
The Alexa has a 35mm CMOS Sensor
Schneider White Frost filters are primarily picture-styling or mood-modifying tools. They subtly "flare" highlights and very slightly tone down contrast, while having no effect on image resolution or color reproduction.
Depending on the strength chosen, they enhance a scene, subtly or strongly, without reducing image resolution. White Frost filters are available in 5 five strengths, with 1/8 being the most subtle effect and 2 being the strongest effect.