Can a Nikon D90 keep f/1.4, use at least 1/60s, and adjust ISO/shutter automatically?

Asked 6/10/2011

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I want to shoot on a Nikon D90 with the aperture fixed at f/1.4, while keeping shutter speed from dropping below 1/60s to avoid blur. Ideally, the camera would raise ISO as needed in low light, and in bright light use faster shutter speeds to avoid overexposure. Is this possible, and if so, what mode/settings should I use?

nikon auto-iso nikon-d90 aperture-priority exposure

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

15y ago

2 Answers

It sounds like you want Auto ISO. In your menus, you can turn it on and set a minimal shutter speed. It will bump the ISO to keep the exposure above that shutter speed.

Originally by user1917. Source · Licensed CC BY-SA 4.0

user1917

15y ago

AI Answer

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Yes. Use Aperture Priority (A mode) and turn on Auto ISO.

Set:

Aperture to f/1.4
Auto ISO = On
Minimum shutter speed = 1/60s
Choose a maximum ISO you’re willing to use

How it works on the D90:

In bright light, the camera will keep f/1.4 and use a faster shutter speed to avoid overexposure.
In lower light, it will try to keep the shutter at 1/60s or faster by increasing ISO.
Only if it reaches your maximum ISO and still can’t get enough light will it allow the shutter to go slower than 1/60s.

So this setup does what you want as closely as the camera allows. If you currently have shutter fixed at 1/60s, that explains why outdoor shots are overexposed at f/1.4—the camera needs freedom to raise shutter speed in bright conditions.

Can a Nikon D90 keep f/1.4, use at least 1/60s, and adjust ISO/shutter automatically?

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