Sub­ject ro­ta­tion

NPhoto - - Over To You | The Apprentice -

Sub­ject ro­ta­tion is the name I give to a blur­ring phe­nom­e­non that oc­curs when only one sec­tion of the bike is mov­ing in tan­dem with the move­ment of the cam­era. You’ll see it demon­strated when bikes fly around corners. Here the front wheel moves away from the cam­era, the rear wheel moves to­wards the cam­era, but the cen­tre of the bike (with the biker) tracks rel­a­tively steadily with the cam­era, mean­ing the cen­tre is in fo­cus, but the front and rear wheels are slightly blurred. It’s very hard to cor­rect for this and do­ing so takes a lot of prac­tice – if in doubt, make your shut­ter speed faster to re­duce this ef­fect.

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