When the edge of the picture gets darker
Photography is all about collecting light. Ideally you want that light falls equally on all parts of your sensor. This is not always easy. Especially with fast lenses at larger apertures, the corners may get a bit darker.
What you will get is an image that is darker on the corners and on the edges especially at larger apertures. However this will not always bother you, you would need relatively bad light and a fairly uniform light background.
Fortunately this is easy to correct:
- The effect is pronounced at larger apertures, and when it starts bothering you it can easily be compensated by decreasing the aperture.
- Modern cameras usually have a setting to compenstae for it. On Nikon it is called Vignette Control. Unlike corrections for distortion it is not really automatic, as it depends (you can set it to different levels)
- It is also a very basic fix during post processing.
- If you are cropping your picture before using, you might be abe to get away with it. The same way, if you use a full frame lens on an APS-C camera you will be effectively cropping.
The tricky part is that, the effect is not always disturbing, and sometimes even pleasing as it directs the view into the center of the frame. If you are shooting with large aperture chances are that it is dark and the falloff will not be so visible as well.
These pages are for Amateur Photographers and not really for seasoned photographers and professionals. I have no affiliation or commercial interest with any brand/make. I write from my own experience. I ended up using mainly Nikon, so I am more familiar with this brand than others. See price for notes on pricing as well as photography related links.