optical aberration
departure of the performance of an optical system from the predictions of paraxial optics
astigmatism
refractive error in optics
barrel distortion
image distortion in photographs caused by inherent imperfections in the camera/lens optical system, resulting in an image where straight lines appear slightly bent, stronger near image borders, such that square objects appear rounded or "bloated"
relativistic aberration
the distortion of light at high velocities
pincushion distortion
image distortion in photographs wherein square objects appear to have an outer shape like a pillow; due to imperfections in the camera/lens system, resulting in an image where straight lines appear slightly bent which is stronger near image borders
defocus aberration
quality of an image being out of focus
coma
aberration inherent to certain optical designs or due to imperfection in the lens
rolling shutter
image capture method
astronomical seeing
amount of apparent blurring and twinkling of astronomical objects due to atmospherical effects
lens flare
image artifact produced by scattered or flared light within a lens system
distortion
deviation from rectilinear projection (optics)