The variable shutter allows to modify the opening angle, so this camera is a little bit more universal and you can use the same camera for different solutions. You can choose a more closed shutter (short shutter speeds) to keep moving objects sharp.This can be fixed normally in one or two steps which results in one ore two different shutterspeeds. Variable shutterclosing or opening between 0 - max. degree. is used for fade functions.
Not more! You can see at the table above: you have allways keep in mind what you actual do!
Variable shutters can range normally from 0° to 170° (Nizo 480 up to Nizo “professional” range from 0-150° and has one step at 75°. This results in two shutterspeds for filming of 1/86 and 1/43 sec. Other cameras have other shutteropenings and differs ( see table),
- variable shutters have their advantage in more sharpness of objects during movement (due to possible shorter shutter speeds) -
- but also a disadvantage in lowlight conditions. You had to use other film with higher filmspeed or artificial light.
You see: for lowlight conditions with normal 18 or 24 fps special cameras are much more usable. This is the domain of cameras with standard shutters e.g. BOSCH/ BAUER or some other cameras with shutter openings from 200° up to 230° and gives you 20%- 25% more light than a NIZO 800, 801 or PROFESSIONAL !) plus lowlight lenses (1.2 or 1.4). An exception are Canon 814 and 1014 which are constructed with a variable shutter with two positions of 150° plus XL shutter 220°.. Using a solid tripod, cable release or remote control with lowlight cameras is s “must” to avoid soft pictureframes.
The intermediate standard shutter (170 - 190°) is a good choice and recommended for standard usage.
A camera with 150° or 160° standard shutter (~ 1/43 sec) is a good choice if you want to get sharp pictures and avoid the risk of soft pictureframes. Here you can get for less cameras with good lenses (except rare collection items).
But keep in mind: scenes in 18 or 24 fps with fast movements are never clear and sharp. even if you have shutter speeds of a variable shutter! Maybe the Beaulieu 4008 with its “highspeed” variable shutter (1/65 -1/130sec.) and a Fujca (1/41 up to 1/161 sec) is a good choice....