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Old Jul 11, 2003, 11:42 AM   #1
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Default ISOs and Resolution

Greetings,

ISOs and Resolution:

I have an EOS D-60 and use the LARGE/FINE resolution setting (3072x2048 pixels) at ISO 100.

What difference in resolution would occur if I increased the ISO to 200, 400, 800 ... even 1000!? Is there a way to ascertain the respective pixel values?

Many thanks.

M i k e
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Old Jul 11, 2003, 12:36 PM   #2
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The two values are unrelated and independent from one another:
o Resolution is fixed after you have selected the setting and is derived from the selected #of pixels/picture size you want to save.
o ISO is the sensitivity to light (or speed of the film), the higher the faster. ie more sensitive which allow you to shoot @ higher speed in lower light.

So why not shoot at higher speed? Just like grain in film as the ISO get higher so is the noise or larger grain!
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Old Aug 10, 2003, 11:35 AM   #3
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NHL, I have a D60 w/70-200mm f4.
I would like to take shots of Motorcycle racing. in bright sunshine.
I've been playing with ISO 100 and 400. ISO 100 seems sharper. what do you think?
I've been using the sports auto mode.

check out some albums.
ISO 100 sport shots here. older albums are at ISO 400. most shot with the sports auto mode.

http://www.dotphoto.com/go.asp?l=TwoBuells&AID=947537

thanks,
Mike
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Old Aug 10, 2003, 4:49 PM   #4
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It doesn't look like you have any problem, some excellent shots and follow through there.

If you want to stick with ISO 100 then you can invest in a faster lens like an f/2.8 to compensate for the slower ISO. Sigma makes an excellent EX 70-200 f/2.8 HSM @ reasonable cost, which I like a lot and buy you a shallower DOF @ wider aperture. You can then put it to good use to isolate your subjects from the more blurry background.
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Old Aug 10, 2003, 5:46 PM   #5
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NHL, thanks for the tips and coments on the albums.
My next lens is going to be a Canon 28-135mm IS f3.5. I take all those shots hand held.
I've had the D60 for six months and I'm still learning. My first Digital was a Sony DSC 85, but I wanted something faster.
I do had sights on an f2 lens in the future.
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Old Aug 10, 2003, 5:53 PM   #6
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Default Re: ISOs and Resolution

Quote:
Originally Posted by shamrock838
What difference in resolution would occur if I increased the ISO to 200, 400, 800 ... even 1000!? Is there a way to ascertain the respective pixel values?
Turning up the sensitivity (ISO equivalent) will increase noise, which looks like grain. Improvement in apparent resolution might well appear because of diminished camera shake, or increased depth of field due to a smaller aperture.

I posted some comparative test shots in these forums showing the noise effect on my (much cheaper) camera.

See http://www.stevesforums.com/phpBB2/v...?p=52343#52343
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