08-29-2016 09:15 AM
I was out the other day in a low light (foggy & drizzly) condition and took some images along a coastline. Oddly enough the images taken with the lens at nearly full extension (about 115mm) had a serious amount of vignette but those taken at mid focal length or less (60mm down to 20mm) showed no evidence of vignette. The f/stop in all case was 7.1. Shutter speed was 1/125. Fortunately I was easily able to remove the vignette effect in Photoshop. I was truly amazed at such "lens distortion" on this lens at such a long focal length. I have used that lens on several different occasions and have never notices this problem. Anyone out there with a similar experience?