[cfkw]

Why is the 光圈與快門 values used can be the same for my DC and Nikon SLR. To me, it seems that DC and SLR use differnt materials to sense the light, so the resulting aperture values should be different for DC and SLR under the same shutter speed. What is teh secret of that please?

[hkhei]

因為dc(ccd) o既iso define到同菲林一樣..
而光圈同快門亦都有相同o既definition....

希望答到你o既問題...

[cfkw]

yeah yeah
I forgot about the ISO/DIN. Problaby they adjust the definition of that to
suit our common purpose as F bumber follows strict definition of
diameter of aperture divided by focal length of lens. There is no room to adjust.