I am new to the forum,but I hope someone can shed some light on my propblem. I purchased this 28MM AE lens 2nd hand. The problem is that when the lens is set to f22,16 or f2.8 the RX viewfinder reads correctly. When set to f4 it reads 3.5, f5.6 reads 4.5, f8 reads 6.5. This does not happen with the 50MM 1.4 lens or a 70-210 Vivitar c/y mount lens,only the 28MM AE. I feel the lens is malfunctioning,or is this normal for a AE lens on this camera. This occurs also in the Av setting also. Even though the viewfinder reads different from the lens;I am sure the lens apeture is correctly set. Otherwise the lens is good. Can this be repaired for a reasonalble cost, or would I be better off looking for another lens? Am I right that the lens is indexing correctly in fact,but just with a bum read out. Thanks for your help