QUOTE(edwardgsk @ Feb 14 2011, 11:28 AM)
I agree with this. 
When I compare 2 sample pictures taken with 17-35mm at 35mm f/2.8 and 24-70 at 35mm f/2.8 using a same camera with same shutter speed and ISO, the picture taken with 17-35mm will appears slightly brighter.
Then, I compare 2 sample pictures taken with 50G at f/2.8 and 24-70 at 50mm f/2.8 using all the same setting again, the picture taken with 50G also appears slightly brighter.
I think the number of elements inside a lens does affect the amount of light loss when light passes through the lens into the sensor. Glasses in the lens still reflects some lights away when light passes though it, that's why we are able to see the "'elements" in the lens. When we look into the lens from the front, we can see reflections of our self on the glass. That also proves that not 100% light passes through the glass when we are taking photos. Some amount of light that enter the lens are reflected back outside the lens by the glasses.
My lecturer gave us a common theory when looking for lens, "The lesser the amount of element in a lens, the better it is for taking photos. "
ya glass is not 100% let light pass trough ...if not we already always hit glass hahahaha... When I compare 2 sample pictures taken with 17-35mm at 35mm f/2.8 and 24-70 at 35mm f/2.8 using a same camera with same shutter speed and ISO, the picture taken with 17-35mm will appears slightly brighter.
Then, I compare 2 sample pictures taken with 50G at f/2.8 and 24-70 at 50mm f/2.8 using all the same setting again, the picture taken with 50G also appears slightly brighter.
I think the number of elements inside a lens does affect the amount of light loss when light passes through the lens into the sensor. Glasses in the lens still reflects some lights away when light passes though it, that's why we are able to see the "'elements" in the lens. When we look into the lens from the front, we can see reflections of our self on the glass. That also proves that not 100% light passes through the glass when we are taking photos. Some amount of light that enter the lens are reflected back outside the lens by the glasses.
My lecturer gave us a common theory when looking for lens, "The lesser the amount of element in a lens, the better it is for taking photos. "
Feb 14 2011, 11:31 AM
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