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Old 20-04-2009, 16:33   #1 (permalink)
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Need Help in ISO''s

Hi all,

I have recently started a photography course and I am having difficulty in noticing differences in the picture apart from lighter and deeper colours when using low and high ISO when taking pictures outside on a clear day... Any help as I am struggling to see any changes or I have a rubbish mointor. Any help welcome!
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Old 20-04-2009, 17:05   #2 (permalink)
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Re: Need Help in ISO''s

A good test to look at different ISO settings, or something I did on my C&G course was to set up a still life. I used a Gerbera in a vase. Set the camera up on a tripod, set the apeture to f5.6 on apeture priority and then took a shot at each different ISO from ISO100 up to ISO1600, then look at them on screen and you should be able to see a difference in the grain from smooth at 100 to very grainy at 1600. You'll also notice in apture priority mode, how much the shutter speed increases with each step. If you can't see anything on you need to print them out and you should see a difference then.
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Old 20-04-2009, 17:14   #3 (permalink)
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Re: Need Help in ISO''s

Good advice from Sarah there. Set up the camera and take shots at different ISOs to see the difference. The grain will increase as already mentioned. And as you've noticed the colours will decrease in punch and saturation.
The positive side of it is that the higher the ISO speed, the faster the exposure time you get at a given aperture, so you can sacrifice a bit of image quality to increase the liklihood of getting a sharp shot in lower light situations.
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Old 20-04-2009, 17:53   #4 (permalink)
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Re: Need Help in ISO''s

Thanks guys, will try again.
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Old 20-04-2009, 18:42   #5 (permalink)
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Re: Need Help in ISO''s

Have a look at this comparison i did with the nikon d3.

http://www.pixalo.com/community/phot...-d3-31293.html
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Old 21-04-2009, 11:50   #6 (permalink)
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Re: Need Help in ISO''s

Also depends what images you are mostly shooting.

For landscapes you're mostly often best using your lowest ISO setting, in Aperture priority mode. In lower light setting and higher F number(eg F16) this will warrant the need of a trusty tripod.

For moving subjects, eg sport or handheld shots then you may need to up the ISO a bit. I'd still try to keep your ISO as low as possible providing your getting a reasonable shutter speed. Otherwise you'll start to lose detail / suffer from noise in your picture. If you've got a modern camera then you may only see the differences on your monitor when you enlarge the picture to 100% (Actual pixels) or more.
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