View Single Post
Old 18-01-2009, 08:59 PM
rogerco's Avatar
rogerco (Roger)

rogerco is offline
Join Date: Sep 2007
Location: Woodford,NSW,Australia
Posts: 388
As I understand it Ha is a narrow band filter that lets through just a narrow band of radiation outside of the visual range. As such it is additional to the visual light componant of the luminance.

Reply With Quote