total diameter: 180mm, flatfield diameter: 170mm
ND 0.6 filter
The new Hercules Flatfield Panel is an advancement in the well known technology of EF flat field foils. Tthis new product line was especially designed to match the needs of astrophotography. It consists of a thin electroluminescent foil which emits an even, gentle white light after an external voltage is applied to it. The Flatfield Panel is a new light source technology for taking flat field images for use in calibration with digital images.