The different ISO values

[contributor_M]

Question.

If you can select a range of ISO's, between 100 (or 50) to 6400 (or greater), and 100 and lower gives you the best quality, why would you shoot anything above ISO 100, especially if you have a tripod?

[JohnT]

For one thing, a higher ISO lets you use a higher shutter speed for action shots, especially in poor lighting conditions. Then there's shooting hand-held when a tripod isn't practical or can't be used. Other conditions apply as well.

[LanceHaynie]

What about when you dont have a tripod? Or it's low light and a slow lens? ..or both?

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[dminton]

Because you don't always want to shoot things wide open at 1/5 second.

This is an exaggeration but not far off.

You will use your aperture to control your depth of field, and shutter speed to stop or enhance motion. Your ISO will be whatever is needed for a correct exposure with those two settings.

For instance think of a landscape scene with flowing water in it. If you don't want the water to be a smooth blur, then you will need a fairly quick shutter speed.

[contributor_M]

So, would it be good practice to say that your ISO is dependent on the shutter speed that you want to use then?

[Tom]

Originally Posted by contributor_M

So, would it be good practice to say that your ISO is dependent on the shutter speed that you want to use then?

Everything depends on the light.
sie
You may want to use a very narrow aperture for a deep depth of field. So you need a higher ISO.

Pretty much the only time I am at 100asa is when I am shooting outside during the day or in the studio. But without cropping in, I doubt anyone can tell the difference on my cameras between 100 and 400. Maybe even 800.

[venchka]

or...........

You could become rather famous without worrying about all those pesky rules. Like focus, camera shake, optical quality, etc.

Post-War Sufferance: An Interview with Andy Spyra The Leica Camera

Counterpoint to Thomas...pretty much the only time I am above 50 is when I absolutely positively MUST be. I use 25 when I can get it. Old habits die hard.
Something I am digitally experimenting with: Pushing digital. Just like pushing film. Underexpose. Overdevelop. so far, it's looking good for me. YMMV.

[Tom]

Counterpoint to Thomas...pretty much the only time I am above 50 is when I absolutely positively MUST be. I use 25 when I can get it. Old habits die hard.
Something I am digitally experimenting with: Pusging digital. Just like pushing film. Underexpose. Overdevelop. so far, it's looking good for me. YMMV.

I shot at 2500asa last night. It was fine. A little grain never hurt anybody.


That is at
1/800th
2500asa
f/2.8
4400k

[venchka]

Horses for courses. If I were doing what you do, I would use all of the tools at my disposal. Action sports definitely qualifies for "pretty much the only time I am above 50 is when I absolutely positively MUST be."
Glad you used ASA! Grinning.
Stunning photo by the way.

[Tom]

Glad you used ASA! Grinning.

I like using asa because it confuses the kids. /actually shot and developed my own film to learn photography.

[venchka]

Originally Posted by Thomas Campbell

I like using asa because it confuses the kids. /actually shot and developed my own film to learn photography.

There you go. Good for you!

[contributor_M]

So, regarding the reference to Thomas, if it still looks good, then I shouldn't worry about the ISO speed then right? Higher ISO's wouldn't affect anything if one was to print something?

[Tom]

It is all a taste thing.

I'd rather bump my iso to whatever it needs to be in order to get the shot.

Sharp > Noise

[Jake]

Originally Posted by contributor_M

Higher ISO's wouldn't affect anything if one was to print something?

Generally speaking, higher iso(or asa for the old farts) will have more grain and less dynamic range than lower iso.
You make the call on what you need as you shoot.

Shooting landscape with a tripod? Low iso would be the better choice.
Shooting football at night? High iso would be the better choice.

[bonita]

Oh boy, looks like a still have tons to learn...enjoying readind all this trends though....thanks for posting :D