f/1.8 on m4/3, ASP-C, FF; are they the same?

Started Nov 1, 2010 | Discussions thread
seachicken2000
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Re: Equivalent Values
In reply to Adventsam, Nov 2, 2010

m4/3 20mm F/1.7 ISO 200, 1/100s
s roughly equivalent to
FF 40mm F/3.4 ISO 800, 1/100s

I think this is absolute rubbish, get real, no way this is true

It's true.
1/100s = 1/100s - I'll take that as given
20mm = 40mm - same angle of view
f/1.7 = f/3.4 - same diaphragm diameter, gives the same DoF and exposure

ISO200 = ISO800 - make the same exposure onto an area 4x as large you need to make the sensor 2 stops more sensitive

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