Originally posted by WPRESTO It's your photo and your call, but I like that a little better. During darkroom days, adding a little vignetting was very common, almost universal for portraits. I have the impression that the technique has fallen out of fashion in the digital era. Photographers are now more concerned with eliminating vignetting, regarding it as a lens aberration. Perhaps other Pentaxians will comment.
Vignetting can be a very useful. A bit of vignetting helps reinforce the centrality of the primary subject, enclose it in its own little universe, invoke a nostalgic memory that is fuzzy/dark at the edges, and perhaps even add a hint of voyeurism.
On the other hand, it can harm some types of images that seek to create a more open or boundless feeling. For example, with a landscape, you might want to convey a sense that the forest, mountains, clouds, etc. extend on forever out of the frame. Enclosing such a scene would make it seem smaller and less grand. Or if the focal person in the image is looking out of the frame, a vignette would tend to break their gaze.
Like every method or rule in photography, vignetting has it's uses but can be easily over used.
P.S. I do really like the vignetting for northcoastgreg's image in reinforcing the loneliness of the derelict ship and bring forth the notion of old memories of it's past service on the seas.