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:

with static subjects,... the f-stop will make a big difference, mostly to depth of field and sharpness: I don't want to end up with a very small aperture like f/22 (which will soften the picture due to diffraction effects) - optimum sharpness is usually around f/5.6 - f/11 - and I don't want the camera to try and set a wider aperture than the lens can do, which will underexpose, as mentioned earlier.  I probably wat to control depth of field to be deep (landscapes, narrow aperture like f/11), shallow (portraits, f/2.8 - f/4) or medium (group shots, usually f/5.6).  So setting the aperture in Av mode, and taking whatever shutter speed the camera chooses as long as it's hand holdable, works fine.

for fast-moving subjects ... Tv mode ... will not guarantee you the fastest speed possible...  If you use Av mode and f/4 you'll always get the fastest shutter speed possible.

I might use auto-ISO mode (set 1/1000 sec, f.4, and let the ISO vary as it wants).  But if the fastest shutter speed is crucial I'd use Av mode, lens wide open, and a high ISO value.

Mike, You make everything so clear - your explanation is something I can put into practice.  For quite some time, I have been using Av, but started playing with Tv because I thought it would help with things like motion blur.  Now I understand why this isn't working!

My reason for trying Tv is because I want to take pictures of birds in flight, especially hummingbirds once they return for the summer.  Live and learn!

Thank you so much.


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