Lens fringing can happen when the camera lens is shot at its widest aperture.
In addition to digital single lens reflex cameras, Canon also produces a number of lenses that can be used on its cameras. The EF-S 55-250 f4-5.6 is designed to be a general all-purpose zoom lens that will provide focal length coverage for most situations. Fringing, a slight darkening around the edges of the frame, can happen with a number of lenses. It will generally happen when the lens is used at its widest aperture.
Instructions
1. Attach the EF-S 55-250 lens to your Canon camera by lining up the red dot on the outside of the lens barrel to the red dot at the 12 o'clock position on the camera's mounting ring.
2. Rotate the lens clockwise until it clicks into place.
3. Turn the camera on, and turn the exposure mode dial to the setting "Av" for aperture priority.
4. Turn the wheel located just in front of the shutter release until the aperture is at its widest setting. This lens has a variable aperture, and will open to f4.0 when it is set at the 55mm focal length and will gradually close to f5.6 when it is at the 250mm focal length. By setting the camera to aperture priority and setting the aperture at its widest setting, the lens will always revert to this setting as it is adjusted.
5. Turn the focal length adjustment ring on the lens until you are at or near the maximum zoom setting.
6. Take a picture by pressing the shutter release, press the playback button, magnify the picture and you will see a slight fringing in the four corners of the image.
Tags: focal length, aperture priority, aperture widest, aperture widest setting, EF-S 55-250, happen when, number lenses