Looking at the exif data these were all with the 100-400 mkii and a 1.4 tc ,yes good pics but unless the exif is false it doesn't show any t.c stacking ,I get 850mm with the sigma and 1.4 tc ?
Nice images. I'd be very happy with them.
Canon 6D; Canon 760D;Canon G15;Canon 40mm f2.8(Pancake);Canon 50mm f1.8(ii); Canon 17mm-40mm f4L;Canon EF-S 10-18mm f4.5-5.6 IS STM;Canon EF-S 55-250mm f4-5.6 STM lens;Canon 24mm-105mmf4L IS;Canon 70-300mm f4-f5.6 L IS USM;Kenko 1.4x HD TC;Canon 430EX ii flash;Giottos tripod;Manfretto monopod;Cokin P filters + bits and pieces!
North Wales where music and the sea give a great concert!
Thanks Nat, I was getting lens faults with the Kenko 1.4 and had stopped using it, lost faith in them to be honest, but the Canon works perfectly. This was a really windy day, Storm Doris on her way, when it's not so blustery I will try the Canon 2 times convertor with manual focussing for a comparison shooting hand held.