Why does the EM-1 have a DOF Preview button?

Started Sep 20, 2013 | Discussions thread
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turnschuh Regular Member • Posts: 237
Why does the EM-1 have a DOF Preview button?
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Hello,

by default one of the Front-Lens buttons on the EM-1 is set to "DOF Preview". So I wonder why does the EM-1 need that Button? Doesnt it like other mirrorless cameras always show the right aperature?

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