| 摘要 |
<p>PURPOSE:To reduce an effect of external diffusion and to minimize time delay from trigger-on regardless of the magnification or the sort of a lens by constituting a photometry device so that the photometry of light passed through the lens can be directly executed by the separation of polarized light. CONSTITUTION:An optical low-pass filter means 2 that double refraction for preventing the pseudo resolution of the light is utilized, a photoelectric conversion means which photoelectrically converts the light, a polarized light separation means and a photometry means are provided. That means, a photometry element 10 is arranged on an optical axis polarized by a polarizing beam splitter 11 so that the photometry of the light passed through the lens 1 can be directly executed. Thus, the effect of external diffusion is reduced and the time delay from the trigger-on is minimized regardless of the magnification or the sort of the lens.</p> |
