Luminous landscape

Definition:Vignetting–In an optical system, the gradual reduction of image illuminance as the off-axis angle increases,resulting from limitations of the clear apertures of elements within the system.(The Photonics Dictionary)
News Flash #1:Allwide angle lenses vignette to a greater or lesser extent
News Flash #2:Digital sensors display vignetting more than does film
Kennedy Forest. Ontario. February, 2006
Cambo Wide DS with 35mm Digitar lens and Phase One P25 @ ISO 100
Many newcomers to photography, especially digital photography, are shocked when they discover that their wide angle lenses display vignetting. They are especially peeved when they find that their extreeme wide angle zooms vignette a lot, especially when used on a DSLR.
The reasons are twofold. It simply isn't possible to design a very wide angle lens that doesn't vignette. Even high-endSchneiderandRodenstockWA lenses for view camera have optional center filters (worth more than most people's lenses) to compensate ...