Since gaining a 1.4x converter the weather has been horrible when I've been able to try it. That is until yesterday when the sun was out all day and the wind was very slight. A few attempts at the Fulmars turned out to be a worthwhile test for both the quality and the speed of focussing.
An earlier shot of a Robin as well here which was my first shot with this combination, although the light was very poor for this one.
Robin at Tide Mills.
Fulmar along the Cliffs.