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| 600 II + 1.4xTC MkIII on 7D |
Today was the first time I used the (600 II + 1.4xTC III) combo on 7D (handheld).
The reasons for 7D today were as follows:
(1) I thought the ducks were going to be quite distant, thus I wanted to have the max camera sensor pixel density.
(2) Good light and largely white ducks meant I would not have to go over ISO 200.
(3) I was not going to shoot any birds in flight.
Based on those three criteria above I thought 7D was a good choice. However, I could not anticipate the severity of AF response loss.....quite pathetic even on stationary and contrasty targets which were well lit. Granted, if I switched the lens to the partial (upper) focusing distance limiter setting, I could have improved the situation somewhat.
Another problem was a bit of an AF calibration drift with that particular setup......that is something that could be remedied if I really cared to do it.
At any rate, the bottom line is that even my ancient 1DMkIIN and 1DsMkII have a decidedly better AF response with 600 II + 1.4xTC III, let alone 1DX.
That just goes to show that there is more to "reach" of a setup than the sensor pixel density alone.
Here's a few shots with the setup in order to enliven the post.