I've used a number of film lenses on the Pentax DSLRs and the only one that has produced the small aperture blue spot has been the AF50/2.8 macro. FA35/2, F28/2.8, F50/1.7, A50/2.8 Macro, and a number of others of various brands have had no issue here. Has anyone noted any other lenses with this characteristic?
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