I finally 'get' equivalence

Started May 22, 2012 | Discussions thread
Fygaren Regular Member • Posts: 238
Re: light gathering

Light gathering is based on FOV and aperture, and 4x light does not hit a full frame sensor compared to 4/3 as the OP said. At the same aperture the exact same amount of light hits the sensor, that is why the aperture area of a 4/3 lens is 1/4 of the area of a FF-sensor(same FOV). So in fact, 4x more light hit a 4/3 sensor when you compare it with the area of FF (with same aperture and FOV). Ill try to illustrate this:

The FF lens(red) will "bend" the light towards the sensor furter out in the FOV (blue), the exact same light will just travel further berore it is "bent" towards the sensor with a 4/3 lens(green). In fact, if you go for similar DOF say f2 on 4/3 and f4 on FF, only 1/4 of the light will hit the FF sensor compared to the 4/3, thats why you have a two stop advantage over FF with shutter-speed or ISO when shooting with the same DOF. As for dynamic range Im still reading these forums to learn.

Yay, first post!


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