400mm Mk III vs 600mm Mk III

I did this for fun. Seeing I was lucky as this female Red Winged Blackbird stayed in the same area for me to take comparison shots of both lens the 800mm range with extenders. I shot both handheld and used the same processing on both. Not scientific but I think it gives a real world use comparison to me anyway. The 400mm with the 2x does amazing.

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Uploaded on March 13, 2019
Taken on March 12, 2019