Westminster fountain at sunset

by Jorge Córdoba

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

Take the 2-minute tour ×
Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. It's 100% free, no registration required.

How can I configure my Nikon D-90 with minimum shutter speed of 1/60th of a second and aperture of f1.4 and have it adjust the ISO and speed as needed? I currently have it working with 1/60th fixed speed, but then outdoor pictures are overexposed.

I want the f-stop to hold at f 1.4 and the speed to be fast enough that I don't get blurred pictures and adjust the ISO as needed with faster shutter speed if maximum ISO would over expose.

Is this possible on the Nikon D-90?

share|improve this question

2 Answers 2

up vote 1 down vote accepted

If I understand correctly, you want:

  • a fixed aperture value (in this case, f/1.4)
  • a variable shutter speed not to go below a given minimum (in this case, 1/60th of a second)
  • variable ISO in order to maintain said shutter speed.

You want aperture priority mode, configured to use a minimum shutter speed. According to the D90 manual on page 166:

In exposure modes P and A, sensitivity will only be adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed. Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity.

The only cases in which the camera would drop below your minimum shutter speed is if the camera has already adjusted the ISO and still cannot obtain a correct exposure.

share|improve this answer

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.

share|improve this answer
    
I think that is what I've done, only the shutter speed is fixed not minimum, hence my question. –  WilliamKF Jun 11 '11 at 0:37
    
@WilliamKF Are you in aperture mode then? –  rfusca Jun 11 '11 at 0:49
1  
In manual mode, it keeps aperture and shutter speed constant and varies ISO to maintain 'proper' exposure. In aperture mode, it holds aperture constant, and varies ISO to stay above the shutter minimal. –  rfusca Jun 11 '11 at 0:51

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.