Whats a Spot Filter?
Motorized iris versions of Schneider lenses are supplied with a Spot Filter. If you look through a lens with a Spot Filter, the Spot Filter appears as a small, dark “spot” at the center of the lens. The Spot Filter is a reflective type (wavelength independent), Neutral Density, radial, gradient filter. It is deposited on a glass surface that is located coplanar to the optical stop surface (at the iris blade location). The Spot Filter allows rapid light-sensitivity adjustment. Light passes thru the spot filter from the center which is fairly dark to the edges where is phases out to 100% clear. So, if the iris blades move just a little bit, you greatly impact the overall light level that passes thru the lens. Motorized lenses can be purchased without the spot filter, but there is no price difference. Almost all of our customers want the spot filter once they understand what it does. The only times we have seen customers not want the spot filter on a motorized-iris lens is when the applic
