First post - so I might screw this up. Anyway, if you can see the photo of my Xt2 then you can see the melting that has occurred after using the 90 F2. Yes I do shoot onto the sun but not for long exposures and I'm careful (knowing that live view in mirrorless means the sensor is always being exposed while the camera is on) not to spend too much time shooting the sun. I would have thought that if it was a case if the sun being magnified it would melt the sensor and not the frame around it (the sensor appears fine) The worst part is that I just switched to the xt2 after going through what I thought was two xpro2's that had melted parts inside near the sensor! And it might be my/the lenses fault! Any help anyone might have would be appreciated.