A7r 24-70 vs Nex-7 16-70 vs EM1 12-40

Started 9 months ago | Discussions thread
bigley Ling
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Re: EM1 12-40 vs Nex 5r speed booster with 24-105L
In reply to forpetessake, 9 months ago

forpetessake wrote:

Not just unscientific, it's flawed. The 12-40/2.8 is full equivalent (disregarding aspect ratio) of 24-80/5.6 on FF, not just DOF. You set it on f/2.8, i.e. f/5.6 on FF. And 24-105/4+SB on APS-C is full equivalent of 25.6-112/4.26 on FF, which you set at f/4, i.e f/4.26 on FF. So what are you comparing?

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The 12-40mm pro lens I believe still takes in light at f2.8 ,and yes the effective DOF is 5.6.

I was just trying to see which has more narrow DOF. F4.26 is larger than f5.6 for DOF so I guess the Canon will still have leading edge for DOF.

Am I wrong is saying that both lens would be working at f2.8 for light?

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