I took this picture today. The weekend before I was taking pictures inside a wedding chapel. I never switched lenses. BUT I get this dust, or something like it, that I've not seen before. I came home and I'm gonna use my air thingy to clean it out. Is this something people see often?
That doesn't look like normal dust, more like a hair or small fibre somewhere. It should come off with a bit of blowing. To test for dust set your aperture as "small" as possible (f/22), focus on infinity, and shoot a white card.
