Abstract: A coronametric instrument includes first and second optical axes respectively responsive to first and second fields of view slightly removed from the sun. The first optical axis is adapted to be pointed at the sun, while the second axis is slightly angularly displaced from the first, having an intersection approximately at an entrance aperture of the instrument. On the first axis first and second occulting discs are respectively positioned in front of and behind the entrance aperture. The first occulting disc shades the entrance aperture from direct solar radiation. A lens system and the discs are arranged so that a slightly out of focused image of the first disc is formed on the second disc so that the second disc absorbs light diffracted from the first disc.