Hi All I have noticed in some photos, in the corners there is a "black shadow" Does not happen all the time and in not consistent in severity... Not sure if it is only 1 lens or not... Suggestions? Thanks
Looks to me like vignetting is creeping into your images. Vignetting usually occurs with large aperture settings, it could be compounded by your lens hood. Generally stopping down will cure this.
Second vote for vignetting, after looking up your lenses. True a lens hood could show up as well similarly, did you have a lens hood on? I ruled out the EF 70-300 as it is a full frame lens and should not vignette on a crop body. The EF-S 18-135 however is a different story. https://www.lenstip.com/275.8-Lens_review-Canon_EF-S_18-135_mm_f_3.5-5.6_IS_Vignetting.html Testing shows noticeable vignetting at wide aperture especially at the far ends of the zoom range. Subject matter makes a difference, for example you will also notice it on brighter background like a blue sky easier than other subjects.
Just a couple of questions. What camera and lens combination? What focal length do you tend to see this? Do you have any screw in filters on the front of the lens? Gary
