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Message: <blockquote data-quote="gustafson" data-source="post: 543845" data-attributes="member: 40735">[USER=3903]@Marcel[/USER], I performed your test as suggested with a few manual and AF-S lenses and found that the histogram more or less stayed put on stopping down. However, when using these lenses with the modified TC-16a, the histogram did move appreciably to the right, between 1/3 upto 1EV per aperture stop!! This has been a big learning, and I guess I'll have to apply adequate exposure compensation if stopping down lenses when they're mounted on my TC-16a unless I can fix the TC itself from behaving this way. Sent from my iPhone using Tapatalk</blockquote>