Test number 2 was fun - I decided to test the auto-focus system on my always difficult and usually uncooperative kids. When they see me with a camera - especially if I crouch to get at their height - they come running. They make getting shots very difficult.
That being said - the Nikon D4s is touted as the "sports and journalism" ultimate camera system. With an impressive 11fps - an intuitive and lighting fast auto-focus motor and sensors - and the incredible dual-card buffer system (no lag or waiting for images to write to card anymore) - I figured it would be a good test.
Plus the camera and this large lens are quite heavy - so I also figured it'd be a good test of what shooting in a concert or live event environment would feel like.
I have NO complaints. I changed the auto ISO settings to a stupid 25,600 - exactly 4 times the ISO range my Canon 5D has. The images - while grainy - with the high-ISO noise filter on - they can actually be played with in camera RAW to bring the noise into an acceptable range without loosing detail.
What I think I am most impressed with is the latitude of this camera. I know my Canon 5D like the back of my hand. I know where an image will blow out or loose detail in the murky depths of a shadow. This camera - eh... no problemo. It just chews the shot up and grabs a considerable amount of data beyond where my Canon would give up the fight. Again. Wow. I'm in love.