Defocused unicell photometer with aspheric zone

Defocused unicell photometer with diffusion zone

Dental light curing device coupled to a light measuring device

Detection method and a detection apparatus

Device for combining optical radiation

Device for indicating exposure information in the viewfinder of

Device for measuring energy transfer rates during lasing

Device for measuring feeble light and method thereof

Device for measuring incident light

Device for measuring light incident on an optical system

Device for measuring light incident on an optical system

Device for measuring light under ambient light and/or flash ligh

Digital display circuit for camera exposure meter

Digital exposure meter

Digital exposure meter

Digital light measuring device

Direct ray solar meter and method

Drive device for a light-emitting component

Dual detector laser beam power monitor

Dual mode camera exposure meters