I have the Canon EOS 4000D and when using the wide angle lens or the telephoto lens, I get this dark vignetting effect. Can someone tell me why this is happening and how I can stop it from happening? I'm sure it's something I'm doing wrong but I don't know what.
We will need more info to help determine why you are seeing the vignetting. It could be as simple as the wrong hood or a filter. What you are shooting and how with what lenses and settings are needed. Plus some samples.
BTW, vignetting is easily fixed in post edit if not too severe.