This session focused mostly on BIF with the Sony A1+200-600/F5.6-6.3+1.4x and Olympus E-M1X+150-400/F4.5 with 1.4x and internal 1.25x. The first hour was devoted to the Sony rig and the last 45-min was with the Olympus rig. The zoom rings on the 2 lenses are opposite to each other so this makes it difficult to switch between shots. All M1X shots are at best, 100% crops while the Sony A1 shots often allowed a 30-50% crop due to the larger 51MP sensor. All images were shot hand-held.

Just like humans, a passing Mallard photobombs the mating pair

Sony A1 rig. 1/3200, F9, iso1600, 840mm

An adult Double-crested cormorant

Sony A1 rig. 1/3200, F9, iso1000, 560mm

Sony A1 rig. 1/3200, F9, iso2000, 840mm

Sony A1 rig. 1/3200, F9, iso800, 734mm

Olympus M1X rig. 1/2500, F9, iso640, 1400mm-equivalent

Olympus M1X rig. 1/3200, F8, iso1000, 1400mm-equivalent

Olympus M1X rig. 1/3200, F9, iso1000, 1400mm-equivalent

Probably a juvenile Double-crested cormorant

Olympus M1X rig. 1/3200, F9, iso1600, 920mm-equivalent

While the Sony A1 tracks BIF better, the Olympus M1X is also capable of tracking birds flying head-on and in-focus.

Olympus M1X rig. 1/3200, F8, iso800, 1400mm-equivalent

Like the Sony A1, the Olympus M1X can be configured so the focus point won't switch to a busy background

Olympus M1X rig. 1/3200, F9, iso2000, 1050mm-equivalent