Quote:
Originally Posted by AlphaBjerke
Specifically, he had an expensive lens and I had a kit lens. We were both shooting at the same aperture and the same shutter speed, but he was able to shoot at 200 ISO when I had to shoot at 400 to get the same settings.
What do you folks know about this. It sounds logical to me!
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This isn't true at all. The ISO you shoot at will be related to your shutter speed and aperture. These are equals on any lens. f/4 on your kit lens will give exactly the same exposure as f/4 on his L lens and therefore you should have the same ISO.
Where expensive lenses have an advantage is that the often have larger max apertures (often refered to a fast lenses) than kit lenses. The are often sharper and suffer less from distortion and chromatic aberation etc. So expensive glass is better but it can't magically lower your ISO at an aperture.