Although sensor backside-illuminated ( BSI ) , ’ sensor A9.However , front-end LSI Sony says doubles readout speed A7 III ’ sensor.According Sony , results focusing low light almost twice speed A7 II ’ s.What ’ , focus tracking twice fast.The sensor processing engine enable overall sensitivity range ISO 50-204,800.This helps A7 III perform extremely well low light.In fact , Sony claiming 1.5EV improvement image quality overall vs A7 II.Sony ’ 5-axis optical in-body image stabilisation also hand.It ’ claimed give 5EV extension hand-holdable shutter speed.In tests , found low light autofocusing ’ quite good Nikon D850 , ’ still exceptionally good ( half price ) .Angela , reviewed A7 III , able photograph pair dancers dimly lit room filled smoke low contrast ’ cause much way problems .