The truth about fast glass on m4/3

Started May 21, 2012 | Discussions thread
MadsR
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In reply to topstuff, May 21, 2012

topstuff wrote:

Sure, focal length would be 12-35 ( like the new announcement from Panasonic) but am I right in thinking that the max aperture would have to be , say, F1.8 or thereabouts to have the same effective light gathering as a f2.8 on FF?

It depends on what you are looking at... If you are looking on light-gathering, as in exposure, an f2.8 lens is the same whatever size medium you put it in front of.

What you are probably referring to though, is DoF, and here you are right, a 35mm f2.8 on m43 is the same as 35mm f2.8 on a 35mm chip, but since it is equivalent to 70mm on an 35mm chip you get much further DoF than you would from an equal FoV on FF... Basically we would need a 12-35 f1.4 to get equally thin DoF. Mostly, for thin DoF you would use primes though, on 35mm as well as on m43, the f2.8 zooms are used for their light gathering prowess, having a zoom for ease of use and still be able to shoot in low(ish) light.

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