This is an example of the vignetting you get from a cheap lens. The same cheap 400mm reflex lens that I discussed on my last post (and from the same trip to Whidbey Island and Fort Casey). You tend to get some vignetting with any reflex lens due to design issues, but I was a little surprised at the amount I got in some of my images. I haven’t figured out why some images are more ‘severe’ than others, but there is some in most images. Vignetting can be intentionally added to some images to focus the viewers attention on the main subject. The image below shows how this might work … and is an example of cropping away a lot of the corner areas of the image to minimize the vignette.
Finally, another couple shots from that trip that were cropped to eliminate most of the vignetting.