03-13-2012, 09:58 PM
[quote name='Brightcolours' timestamp='1331627041' post='16639']
Only if you concentrate on ISO 100 = ISO 100 = ISO 100, then the "speed" is the same. However, ISO 100 is NOT the same from sensor to sensor. It says nothing about how sensitive any sensor is, nor does it say what is the total amplification of the signal per sensor. ISO 100 is just the big equalizer, obscuring what is actually going on.
[/quote]
I remember a test I did about a year ago. I had a 5D with 100/2.8 and 7D with 60/2.8. I set both cameras to the same ISO and used Av at f/2.8. I pointed both to an evenly lit wall and shot with both from the same spot. Result, SS was the same. Apparently I was obscured. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />
But I do not wish to quarrel with you. I know I can never win no matter what I say.
Only if you concentrate on ISO 100 = ISO 100 = ISO 100, then the "speed" is the same. However, ISO 100 is NOT the same from sensor to sensor. It says nothing about how sensitive any sensor is, nor does it say what is the total amplification of the signal per sensor. ISO 100 is just the big equalizer, obscuring what is actually going on.
[/quote]
I remember a test I did about a year ago. I had a 5D with 100/2.8 and 7D with 60/2.8. I set both cameras to the same ISO and used Av at f/2.8. I pointed both to an evenly lit wall and shot with both from the same spot. Result, SS was the same. Apparently I was obscured. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />But I do not wish to quarrel with you. I know I can never win no matter what I say.