PURPOSE:To allow the selection of a number of transmitted wavelength areas by providing a mechanism possible for the rotating shafts of a plurality rotary discs to have optical inclinations between 0 and 25 deg. to an optical path, and a driving means therefor. CONSTITUTION:The light 6 from a light source is incident on a camera lens 10 to form the actual image of the light source near a focusing point 15, parallelized by a relay lens 20, and entered into one interference filter, for example, 31 of rotary discs 30, 35, 40, 45. The discs 30, 35, 40, 45 supported by a bearing body 70 are decelerated to a proper rotating speed by a reduction gear 72 and rotated by the friction wheel conduction by a rotating roller 67 long along a rotating axis to detect a positioning small hole 32. Further, the bearing body 70 can incline the interference filter surface at 0-25 deg. to an optical path 6 by rotating a part 78 of a worm wheel having the rotating axis 72 as the center around the rotating axis 72 by the rotation of the worm gear 77 geared therewith. The thus obtained spectroscopic space image is taken into an image processing device 110 through a CCD camera 60 and an image signal A-D converter 100.
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