Testing my 'Gift' OLYMPUS XA with some outdated Fuji 'Surviecolor 400' cut from a bulk tin, Home-processed in C41, i found some strange 'scan lines' on these especially if I make them darker. Lens is not very sharp.
Was your lens displaying a smudged fingerprint? Did you hold the camera steadily? Did you use the correct zone focus (it is not illegal to use halfway, or third, 'steps' with that zone focus). - David Lyga