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My experience since i received my 70-200 f2.8 GM II some months ago, and sold off my prior GM I, is the x1.4 and x2.0 Sony TC's work well but generally i find the x2.0 softer for action/flying birds, a little better for static subjects but I tend to use my x1.4 for 99% of my shots when i am looking for extra reach wherein i see very little fall off in sharpness/quality across the frame on my GII........on occasion when i need to go longer(perceived) i will implement ASC on the go from my programmed C1 button on my A1 with the x 1.4 which preserves the sharpness/quality(apart from a small degree of pixel loss)rather than consider going to the x2.0.It is something i have personally seen during my time with Nikon with their x1.4 and 2.0 TC's but as i handhold my long lenses with elevated shutter speed at these long reaches "operator shake" becomes more of a factor unless you set those shutter speeds way up... +2000From a shutter speed/autofocus perspective i find the GM II much faster due to the linear motors, which i also find on my 400mm, 200-600 to a lesser degree and 135mm f1.8 absolutely..........
My experience since i received my 70-200 f2.8 GM II some months ago, and sold off my prior GM I, is the x1.4 and x2.0 Sony TC's work well but generally i find the x2.0 softer for action/flying birds, a little better for static subjects but I tend to use my x1.4 for 99% of my shots when i am looking for extra reach wherein i see very little fall off in sharpness/quality across the frame on my GII........on occasion when i need to go longer(perceived) i will implement ASC on the go from my programmed C1 button on my A1 with the x 1.4 which preserves the sharpness/quality(apart from a small degree of pixel loss)rather than consider going to the x2.0.
It is something i have personally seen during my time with Nikon with their x1.4 and 2.0 TC's but as i handhold my long lenses with elevated shutter speed at these long reaches "operator shake" becomes more of a factor unless you set those shutter speeds way up... +2000
From a shutter speed/autofocus perspective i find the GM II much faster due to the linear motors, which i also find on my 400mm, 200-600 to a lesser degree and 135mm f1.8 absolutely..........