Close focus
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Close focus

The optical design comprises 17 elements in 13 groups. At its maximum magnification, you can fill your frame with a subject just 25 x 17mm in size (1 x 2/3"). What does that mean in terms of working distances from your subject?

At 1x magnification, the focus distance is 28cm, while your working distance is 11.2cm (accounting for the length of the lens barrel). At the maximum 1.4x magnification, the minimum focus distance is 26cm, while your working distance is a mere 8.6cm (3.4"). At such close working ranges, you'll want to watch for any shadow cast on your object by your camera and lens (and you'll definitely want to remove that lens hood). Ring lights and flashes are quite useful when using these types of lenses.

See that 'Lock' button on the end of the lens barrel? It locks and unlocks a very special control ring on the lens...