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| p.7 #7 · Tamron 150-600 AI Servo sequential shots only |
Here is a sequence of 11 photos captured over 7 seconds with a 1Ds Mkll. It shoots at 4 FPS maximum. Because it is an f/6.3 lens I'm using center point AF only. I use back button focus and did not pump the focus/button during the sequence. The Pelican is flying towards the camera to start, turns parallel to the camera then flies away from the camera before splashing down. The AF lost focus on shot 5, but reacquired focus on the next shot.
The weather was not ideal, but there was some sun. There was also a light fog over the water. Exposure mode was Av, f/8, ISO 800 and the shutter speed varied between 1/1000 to 1/640. Note that the only out of focus shot is the one shot at 1/640, so I suspect part of the blurriness is the shutter speed and not lost focus.
Granted a Brown Pelican is not the fastest of birds, but it does demonstrate that AF does work and on a 10 year old camera to boot. I'm not a spray and pray kind of shooter. I look for position of head, wings etc before pressing the shutter release. I also have to live with an 11 frame buffer. I normally would have stopped shooting once the pelican turn away from the camera, but continued shooting to show what the AF could do with the Tamron.