Pin hole


Pin hole on a black plastic plate

uman eye line spread function as a function of the visual angle in minutes
1. Joseph Goodman, Speckle phenomena in optics, p-180.

Shape: Outer dia 52mm/ inner dia1.2mm black plastic plate
Hole center +/- 0.5mm M52 filter tap center
1mm/(393-345)mm*393/25.4=0.32 visual field angle

  • Spatial angular response to speckle, which is equivalent to human eye.
  • Object distance independent, slight wavelength dependency.

Pin hole on a black plastic plate

Oxide Corporation

Speckle contrast Measurement System