I’ve googled as well as wikid ISO and I have a broad understanding of it. But can anyone explain in their own words what it is and what is stands for? Also, is it the same for video cameras as well? What happened when you change it?
ISO = International Organization for Standardization, http://www.iso.org
In photography it is a measure of the sensitivity to light of the film or sensor.
Lower the number (i.e. iso 100) = less sensitive
Higher the number (i.e. iso 1600) = more sensitive
In practical terms, the lower the iso then the more exposure the film requires to record an image.
So if you are using iso 100 and you can get a properly exposed picture at 1/125 @ f8
If you then changed to iso 800 you would need 3 stops less exposure so you would shoot at 1/125 @ f22. (or 1/1000@ f8)
Shooting at a higher ISO will increase grain or digital noise so wherever possible it is better to shoot at the lowest ISO you can
5 Responses to “What is ISO for photography, or cameras in general?”
I am a photographer, and generally the lower the ISO the less light that is let in the lense and the slower the shutter speed. So if I am at a 100 ISO and have two year old to chase around in my studio the pictures would be blurry because the shutter speed would be lower. If I had upped my ISO to 800 then my shutter speed would be quicker which would capture movements more clearly. Not sure about video cameras but I only use the lower ISO’s in an outdoor situation. The problem is the the higher the ISO the more noise you have in an image. This can be taken care of with ‘noise reduction’ programs if you are shooting with a digital camera. I don’t know about video camera’s though.
References :
http://www.cnet.com.au/please-.....297604.htm
ISO stands for "International Standards Organization".
References :
ISO = International Organization for Standardization, http://www.iso.org
In photography it is a measure of the sensitivity to light of the film or sensor.
Lower the number (i.e. iso 100) = less sensitive
Higher the number (i.e. iso 1600) = more sensitive
In practical terms, the lower the iso then the more exposure the film requires to record an image.
So if you are using iso 100 and you can get a properly exposed picture at 1/125 @ f8
If you then changed to iso 800 you would need 3 stops less exposure so you would shoot at 1/125 @ f22. (or 1/1000@ f8)
Shooting at a higher ISO will increase grain or digital noise so wherever possible it is better to shoot at the lowest ISO you can
References :
It is related to the sensitivity of the sensor. In digital cameras that means the amount of amplification of the signal that has been collected from the sensor. In darker conditions you might need to increase the sensitivity so that you do not need long exposures at wide apertures. As an example you might be photographing hand held indoors.
There is an inverse relationship between sensitivity and quality. This is because at high sensitivity and hence high amplification you are also amplifying noise (signals due to fluctuations of electric currents in the sensing circuit). Consequently there is a trade off between quality and detection sensitivity.
Modern digital cameras usually have ISO ratings ranging from 100 or 200 ISO (high quality low sensitivity) up to 1600 or 3200 ISO (low quality). They normal step up n factors of 2 ie. ISO 100, 200, 400,800 etc. Each step represents a doubling of sensitivity, requiring that the amount of light to get the same exposure as the previous setting is halved.
There is an analogy to film where greater sensitivity is obtained by using larger grains. In this case high sensitivity film has larger grains and hence looks less smooth (more noisy) than low sensitivity film.
References :
lower the iso the best but in low light u need to improve it
the below article can help
References :
http://www.2kstockphoto.info/v......php?id=19