Example discussion http://forum.manualfocus.org/viewtopic.php?id=16344
Frankly, this is the main reason I opted to keep my Vivitar Series 1 90mm f2.5 and sell my Tamron SP 52B (even though I had not yet encountered this problem). I have a theory that if you make a mask for the back of the lens that effectively blocks the outer extremity of the image circle (that was designed for full frame 35mm) you will reduce the internal reflection that is causing the problem... but this is just an untested hunch. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
