alundeb wrote: Tomser wrote: alundeb wrote:
We hear from time to time that 75 mm f/2 on u43 gathers the same light as 150 mm f/2 on FF with the same ISO and shutter speed.
Well, an 8mm lens on MFT at f2 does indeed gather the same light as a 500mm on FF at f2 .
With ISO settings and shutter speed being the same, you get the exact same exposure .
Is there any more to it that I missed ?
There must be at least 17 posts on this page only that explains how exposure and gathered light per image is not the same.
So, if I\'m following this correctly, this is about the loss of efficiency with digital sensors at brighter F-stops and it means also that smaller sensors have a greater loss than larger sensors at the same F-stop? If so, this is maybe what Fuji was stating with regard to choosing F2 for the speed of the X100 lens here:
\"Designing an F1.6 or F1.8 lens is not so difficult; however, in the case of a digital camera, even if an aperture larger than F2 is used, the light receiving elements on the sensor cannot effectively use the brighter portion of the incoming light because of low incident light gathering efficiency.\"
Click \"Story\" then \"Fujinon lens\" at the top to see the quote.
