<p>Hi John,<br>
I use a Yeenon close-focus adapter on an A7s and have not seen any vignetting with any Leica lens that I own. (28mm Elmarit, 50mm 'cron, 90mm Tele-Elmarit, 135mm Tele-Elmar), nor with any Voigtlander lens.<br>
Is your Yeenon adapter LTM or M-mount?<br>
If M, perhaps the combo of an LTM to M to Yeenon to body is causing the issue.</p>