hi iv taken some photos of when i went the chelsea flower show but on the majority of my photos i have this black mark on the left i cudnt see the mark when viewing them on my camera but transfered them to the pc and its there sometimes really thick and black and others a little fainter my camera is sony a200 with kit lens heres some picture any hlpe is really appreciated as i feel my photos are ruined now
the penguin the black mark is at the top as i took the shot sideways
on the left of the pettle
thick black on the water