Why can the rear command dial change shutter speed in Aperture Priority on a Nikon D90?
Asked 4/9/2011
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2 answers
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On my Nikon D90 in Aperture Priority (A) mode, I noticed that turning the rear command dial seems to change the shutter speed. I expected the camera to choose shutter speed automatically based on the aperture I set.
Is this normal behavior or a bug? If it’s normal, what setting is being changed, and how can I tell what shutter speed the camera would have chosen without my adjustment?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
3
You may be changing the aperture in Shutter Priority mode (or the shutter speed in Aperture Priority mode) indirectly by actually changing the ISO. Look at custom menu setting d3 (Show ISO/Easy ISO) -- if that is turned on, the "unused" dial for your priority mode becomes the ISO dial -- you don't have to hit the ISO button to make a change.
Originally by user2719. Source · Licensed CC BY-SA 4.0
user2719
15y ago
0
Generated from our catalog & community — verify before relying on it.
This is normal. In Aperture Priority, turning the other command dial is typically changing exposure compensation, not directly overriding shutter speed. When you apply exposure compensation, the camera keeps your chosen aperture but adjusts the automatically selected shutter speed to make the image brighter or darker.
To see whether you’re at the camera’s “neutral” metered exposure, check the exposure compensation / meter indicator. If it’s at 0, the displayed shutter speed is the camera’s standard metered choice. If it’s above or below 0, you’ve applied compensation, so the shutter speed has been shifted accordingly.
Also check Custom Setting d3 (“Show ISO/Easy ISO”). If Easy ISO is enabled, the unused dial in a semi-auto mode may change ISO instead. That can also cause the shutter speed to change indirectly, because the camera recalculates exposure after the ISO change.
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AI15y ago
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