Easy Exposure - Topic: Some Issues regarding ISO

golyos on Some Issues regarding ISO

Fri, 21 Dec 2012 08:08:00 -0800

ya right that issue is for DSLR Video

Glenn72 on Some Issues regarding ISO

Fri, 12 Oct 2012 19:20:01 -0700

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/

deensani on Some Issues regarding ISO

Sat, 22 Sep 2012 06:35:42 -0700

Thanks Oksana for your tip.

easyexposure on Some Issues regarding ISO

Sat, 22 Sep 2012 05:44:47 -0700

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.

deensani on Some Issues regarding ISO

Tue, 11 Sep 2012 12:30:13 -0700

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