Are there any "rules" for using ISO?

Started Apr 3, 2013 | Discussions thread
OP GreenMountainGirl Contributing Member • Posts: 684
Re: avoid Tv mode

mike703 wrote:

That helps to explain some things.  Shutter priority is a dangerous mode to use in low light because you will very easily underexpose if your lens won't open wide enough.

Mike, Now I understand!  This is definitely a problem, since I don't have any fast lenses.

So slightly perversely the best way to get the fastest shutter speed that you can for given lighting is to

(i) use Av mode and open the lens up completely and

(ii) set the highest ISO you are comfortable with.

Then, the shutter speed selected by the camera will be the fastest you can get for that light.

I have to ask - are there any particular situations where you would recommend using shutter-priority?  Perhaps in bright light?


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