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When you have a fast-mov­ing sub­ject, one crit­i­cal is­sue is your cam­era po­si­tion in re­la­tion to the move­ment. Things move slower in the frame if they’re head­ing to­wards or away from you, faster if they’re mov­ing at right-an­gles to you. This fal­con is a case in point: in the shot on the left, only the wing tips blur at a mod­est 1/250 sec with the cam­era steady, but in the div­ing se­quence, it is fly­ing at al­most 100 miles per hour, and is only sharp thanks to a com­bi­na­tion of down­ward pan­ning and a shut­ter speed of 1/500 sec. This may make the head-on shot seem sim­pler to take, but fo­cus­ing on a sub­ject that’s com­ing straight to­wards you is much more de­mand­ing.

Two views of a pere­grine fal­con, one of the world’s fastest birds. In one, it’s fly­ing al­most di­rectly to­wards the cam­era, and hardly moves in the frame, while in the other it’s fly­ing at right an­gles, making a fast shut­ter speed vi­tal

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