At large tilt angles, there is an exposed internal cuved surface with a very viscous and highly-reflective lubricant on its surface. Also, at large shift, you get a fairly large but less-reflective, exposed internal flat surface that could light up, with the right (or wrong) circumstances. OTOH, I don\'t think I\'ve noticed flare problems with adapter movements that aren\'t also present with no movements, but most of the subjects I shoot with the Mirex aren\'t backlit.
I\'ve had serious internal reflection problems from bright steel adapters that I use with my Auto Bellow N system - a few pieces of adhesive-backed flocked paper does the trick there, but it wouldn\'t help with the moving internals of the Mirex.
