Originally posted by estudleon I want to change to other version or lens.
Even the Legendary pentax 31mm f/1.8 limited has CA wide open, the Pentax 50mm f/1.2 has a lot of it too. Even the zeiss planar 50mm f/1.4 has CA wide open, the Leica summilux 35mm f/1.4 has it too...it's just a fact of life. Wide angle lenses suffer more from it than telephotos because wide angle lenses are rather difficult to design. The only lenses that don't have CA are Apochromatic lenses,which are usually 100mm and longer. However in recent times even labelling a lens APO doesn't actually mean it is actually Apochromatic. Some manufacturers label a lens APO if it has more than two pieces of ED glass in it which doesn't make it Apochromatic at all, it just makes it better corrected than a normal lens.