Some Issues regarding ISO | Basics of Photography | Photo Forum

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Some Issues regarding ISO
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September 11, 2012
12:30 pm
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Hi Oksana, here is an interesting discussion about ISO. I came across a tutorial where someone mentioned a classic rule about ISO. It goes as follows:
Good ISOs: 160, 320, 640, 1250, and 2500
Avoid using: 125, 250, 500, and 1000.
What do you say to that please? It appears confusing to me because from my understanding, the higher you go the grainier the picture but the more sensitive to light the camera becomes and hence the exposure is increased. There shouldn’t be any classification of the ‘good’ and ‘bad’ ISO values. In many tutorials I have watched, the advise is that we start unless necessary with an ISO of 100. So what makes an ISO of 640 better than 125 in terms of noise production to a picture? I need clarification. Here is the link to the page.
http://tinyurl.com/cl92pkx

September 22, 2012
5:44 am
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I heard about this a lot, but never took time to really test it. What they mean is that 160 is better then 125, I guess. Not 640 better than 125. The different between 160 and 125 is so minimal that you might not even notice it.
You can always do the test for yourself. Put your camera on tripod and take multiple pictures with different ISO. You can use aperture priority mode at f8 for example, so shatter speed will change automatically, when even you change ISO.
When compare the picture on your computer by enlarging them. See at which ISO you have less noise. You can also try to make some prints to see which one looks better.

September 22, 2012
6:35 am
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Thanks Oksana for your tip.

October 12, 2012
7:20 pm
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Interesting question this appears to be only for video and I found an answer that multiples of 160 uses full stops of ISO and 125 is simulated stop.
Further information and a test video can be found here:

http://www.petapixel.com/2011/…..slr-video/

December 21, 2012
8:08 am
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ya right that issue is for DSLR Video :)

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