| 摘要 |
An optical device including a lens group which generates an optical image on an image pickup area by focusing an image of a photographing object, an optical diaphragm which narrows light flux optically when the optical portion generates the optical image, an ND filter group which is disposed in front of or behind the optical diaphragm and constituted of a plurality of ND filters each having a different light transmittance, and an ND filter adjusting portion which adjusts a positional relation of the ND filter with respect to the optical axis of the optical portion. At least one of the plural ND filters is an oblique ND filter in which the transmittance change line which is a change line of the light transmittance intersects at least two sides constituting the image pickup area obliquely.
|
