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Why does the preview button lock exposure?

rfc143

US
71 posts

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rfc143 Registered since 03rd Mar 2011
Fri 23-Nov-12 07:35 PM

Whenever I press the function button (Fn), which I have programmed to "preview", it previews the aperature setting ok, but I notice that it locks the exposure too. I've never noticed this before and am curious why it would do that, when you can also program the same button to do just that.

Anyone know?

km6xz

St Petersburg, RU
3571 posts

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#1. "RE: Why does the preview button lock exposure?" | In response to Reply # 0

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Fri 23-Nov-12 06:50 PM

The metering/exposure needs to be locked when stopping down the aperture for preview mode, because doing it any other way would require re-metering when the aperture is returned to fully open when the preview button is released. You are ready to take the shot as soon as preview is cleared.
Stan
St Petersburg Russia

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rfc143

US
71 posts

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#2. "RE: Why does the preview button lock exposure?" | In response to Reply # 1

rfc143 Registered since 03rd Mar 2011
Sat 24-Nov-12 12:07 AM

Makes sense. Thanks!

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