High dynamic range shutter disks:

These are neutral colour shutter disks made with a varying dot pattern.
The dot pattern is created by dedicated rastering software to obtain an accurate and high dynamic range.
The standard dynamic range is from 0.005% to 92.5%, which is the transmission limit of the glass.
Intensity resolution is 0.002%.

The high dynamic range allows precise light intensiy control, especially in the low intensity range near zero.
The dot pitch is typically 0.225mm

This feature allows to install the shutter much closer to the focal plane than other shutter systems.

Optionally we can make the dimmer plate with a stochastic pattern to reduce moiré effects.
In this case dot size can be chosen for the optimum balance between dynamic range and diffraction.

The disks have a good batch to batch consistency.
Because these shutters are of the reflective type, little light energy is absorbed in the shutter making it compatible with high-power lamps
These can be made in any diameter between 22 and 180mm
The standard coating is medium matted aluminum, other coatings are available upon request
Standard substrate glass is Schott Borofloat33 thickness 1.1mm.
Other substrate glass and other glass thickness is available upon request.

Applications: threatre lighting, automated lighting, scientific instruments.

Because of the nature of the substrate glass, transmission is limited to 92.5%
This can be increased to >97% by applying double sides MgF2 broadband AR layers.
Another option is to use the shutter in such a way that it is pulled outside the light path for full transmission.
In that case there will be no obstruction left.
Another option is to have an opening in the disk where 100% transmission is available.

The curve can be linear, x^n, exponential or any other mathematical function.

The disk can be delivered with a centre hole of different diameters.
The disk can have a separate track in the image, allowing for indexing to determine the position.