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Message: <blockquote data-quote="Moab Man" data-source="post: 488295" data-attributes="member: 11881"><p>My line of thinking... Some lenses the glass sits in different locations in the tube. For example, on our Tamron 90mm the end glass is set back quite a ways. Other lenses the last piece of glass is right at the end of the tube. With this one lens that has the heavy vignetting I'm thinking there is something specific to this lens and how it is constructed that maybe it pulls from farther out on the edges of the glass, relative to the Raynox, thus picking up a heavy vignette. That's my best theory.</p></blockquote><p></p>