Closed Variable Wheel Attenuator 990-0704 is used when photodetectors with high sensitivity (e.g. CCD, photomultiplier, etc.) are used and it is necessary to eliminate the side background lighting fully.
A choice of filters is available for our standard 4-wheel attenuators, allowing 256 relative positions of wheels, rendering 99 different transmission values, among which you can find a very close match to the desired value.
The holder of 1 inch filters 990-0415 allows fixation of up to 5 filters into 1 inch optics ring holders. The thickness of optical filters (or any other optical elements) to be held is from 0.5 mm to 8.0 mm.