Heron at Hartsholme park Lincoln, OMD M1 Mkiii 100-400 at 400 mm, ISO 800, f6.3,1/1600 sec. using the 2X in built converter which was suggested to me to use by a nature photographer friend. so this image is effectively a 1,600 mm lens full frame !! Definitely the best detail I have ever got of a heron on the island from the viewing point
Might try with the 1.4X converter and 2X digital as the in built converter does not lose lens speed .when the light is a little better.