FIELD: instrumentation.
SUBSTANCE: this filter comprises drive, plate with variable reflection factor and triple-prism arranged along optical beam, downstream of said plate. Said plate is composed of fixed plate with circular photometric wedge arranged thereat. Besides, this device incorporates first mirror arranged ahead of the plate in beam path at 0°<a<45° thereto and second mirror arranged in beam path after reflection from prism and plate perpendicular to said first mirror. Line of intersection of the planes of said mirrors is parallel with said disc and triple-prism inlet face. Triple-prism and mirrors are arranged for joint rotation about the axis aligned with optical beam axis and disc axis and are connected with the drive.
EFFECT: decreased error in attenuation adjustment, improved weight and size characteristics.
3 cl, 4 dwg
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