Contituation of the Versatility thread

Started Apr 5, 2013 | Discussions thread
FoolyCooly
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Re: Advice for the thread starter
In reply to olliess, Apr 7, 2013

olliess wrote:

FoolyCooly wrote:

Correct my if I am wrong but a f1.4 lens still lets the same amount of light in regardless of the sensor size.

As pointed out already in several threads on equivalence in these forums, a 25mm f/1.4 lens is going to project the same light per area onto the sensor regardless of the format. However, a larger sensor is collecting light from a bigger area.

Think about it this way: to take the same picture as a 25 mm lens on m4/3, you need a 50 mm lens on FF. The entrance pupil on the m4/3 lens is 25 mm/1.4 = 18 mm, while 50 mm/1.4 = 36 mm, or exactly twice as big, meaning 4 times the area to admit light.

OK now I am confused. Shooting from the same position with the same lens, what will my exposures be?

FF Body 50mm f1.8 @ 1.8, ISO 400 1/30th Second

MFT Body 50mm f1.8 @ 1.8, ISO ??? 1/30th second

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