The speed that mat­ters

NPhoto - - Nikopedia -

The ac­tual speed of a sub­ject is less im­por­tant than how fast it trav­els across the frame, which sounds ob­vi­ous, but it’s easy to be over-im­pressed by the mov­ing thing, such as a rac­ing car, mo­tor­cy­cle or low-fly­ing jet. If some­thing takes a sec­ond to cross the frame, you’ll need a shut­ter speed of at least 1/500 sec to freeze its move­ment.

From the same cam­era po­si­tion, a mov­ing sub­ject trav­els more slowly through the frame with a wide-an­gle lens than with a long tele­photo, which mag­ni­fies move­ment as well as other things.

A smoothly trav­el­ling sub­ject, such as a ve­hi­cle on a road, moves fastest through the frame when it’s mov­ing at right an­gles to you and the cam­era, much less when it’s com­ing di­ag­o­nally to­ward you, and hardly at all when com­ing straight at you (that doesn’t re­move fo­cus is­sues, though!)

Parts of sub­jects can move much faster than you might ex­pect in­side the frame – for in­stance, a hand ges­ture from some­one talk­ing, or the blink of an eye­lid, can be ex­tremely quick.

Pan­ning slows down the in-frame move­ment of a smoothly trav­el­ling sub­ject, but not its mov­ing parts (such as the spokes of a pass­ing moped be­low). The main move­ment of the moped is eas­ily frozen by pan­ning at 1/250 sec, but the rapidly re­volv­ing wheel spokes in­evitably blur

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