So I just bought this Makinon 24mm lens for my Minolta XG-M camera. I took it out for a test shoot today and i found this strange green circular glow in the center of most of my photos. I noticed it happened when there was more light in the camera. I'm an amateur so I really don't know how to fix the problem. Is this just an effect of a cheap lens? Do i need a polarizing filter? Here are links to a couple of the photos in question: http://i138.photobucket.com/albums/q259/Iterr/392657-R1-027-12_014.jpg http://i138.photobucket.com/albums/q259/Iterr/392657-R1-051-24_026.jpg http://i138.photobucket.com/albums/q259/Iterr/392657-R1-045-21_023.jpg THANKS!