PhilS

My experience with the 100-400mm with both the 1.4x and 2x converters is very similar. While the results when using the 1.4x at even at full aperture and 400mm are perfectly acceptable for cropping or large prints(A3+), the results with the 2x were always soft, boardering very soft, even when stopped down. I sold the 2x converter.

Very happy with the quality of the 80mm with 1.4x converter. I also use it in conjunction with extentsion tubes to get even greater magnification ratios. Sorry I’m not at my desktop to post any images, but if you’re happy with the 1.4x with the 100-400, you certainly won’t be disappointed with it in conjunction with the 80mm, which is much sharper to start with.

I got rid of my 2x tc because it made the 100-400 far too soft at the long end. The 1.4x works really well with my 100-400 and also the 80mm macro. Phil

Hi, I had exactly the same problem with my XT2, using 64Gb Lexar 2000x UHS-II and Sandisk Extreme Pro 64Gb a couple of days ago (XT2 firmware 4.10). I very rarely shoot video, so don't know when the issue began. I was trying to shoot 1080 @ 29.97P and had the error on four different cards (two each of the above). However when I changed the frame rate to 25fps it worked flawlessly. I Have just tested it at 50P - it worked flawlessly - and again at 29.97P and ironically it is now working without issue. I wonder whether it hd something to do with the latest firmware update (I went from 4.0 to 4.10 without the intermediate roll back) and simply needed the settings altered!?! I wasn't using the battery grip at any point and the battery hasn't been removed or recharged between episodes. Hope you get yours sorted without recourse to the repair shop.