Olympus E-M1X and Oly300/F4 without extender, handheld. processed from raw, ~3000px 100% crop resized to 2400.

PanLeica 100-400, handheld. processed from raw, ~3000px 100% crop resized to 2400

With Sigma 150-600 F4/6.3 and Metabones Speedbooster 0.7x mounted on monopod

840mm equivalent, F4.5 at 840mm which is faster than the Oly 300/4 with 1.4x (F5.6). However, the Oly 300/4 (3.2lb, 9") is much easier to handle than the bulky Sigma lens (a Canon-mount full-frame lens, 4.3lb 10" before zooming to 600mm).

100% crop, raw file sharpened, Topaz de-noised

Bird shots with E-M1X and 300mm/F4, 1.4x on monopod

Montages of head-on flight