| 摘要 |
PURPOSE:To obtain a desirable soft focus effect over a wide luminance range by deciding a stop value and a shutter speed so that the diameter of a blur circle may become almost certain value in a camera capable of driving a lens during exposure. CONSTITUTION:A lens driving means 2 has a function for driving a part of a photographic lens 1(focusing lens 1a) during exposure and a special photographic effect such as the soft focus effect is obtained by driving the lens during exposure. An exposure calculation means 4 decides the combination of the spot value Av and the shutter speed Tv so that the diameter of the blur circle is changed as little as possible with the change of the exposure of a main object and the value may become approximate to an optimum value. Therefore, the soft focus effect which is approximate to an optimum is obtained over the wide luminance range. |
