Circular Graduated Neutral Density Filter

Description

This is a metal film graduated neutral density filter on a circular glass substrate 152mm in diameter. The central bore for the hub is 24mm in diameter. The effective filter area is 60mm wide (extending from 14mm to 74mm radius). The clear diameter of the hub is 26mm. Thickness of the glass is 3mm. The filter is deposited on the surface (no cover glass).

The filter is in fair condition � the metalized film coating appears quite �blotchy� and uneven. The substrate appears to be in excellent condition, however. There is no calibration information with the filter, nor do we know who the manufacturer is. The density appears to become quite great rather quickly. I am not sure what the density curve is supposed to be, or what angle of arc it subtends.

Please see the first photo for indication of coating problems � the line across the bottom of the filter is a reflection, but the mottled appearance is in fact the way it appears.

***MPN
***OEM Custom
***SKU*** DP450