Another Olympus E-M1 and SONY a7 walkabout test, high ISO

Started 11 months ago | Discussions thread
Lab D
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Re: You are rigtht and BS is try to sell Sonys
In reply to blue_skies, 11 months ago

blue_skies wrote:

Lab D wrote:

skyglider wrote:

blue_skies wrote:

How so: in equivalence terms, the Oly 12-40/f2.8 becomes 24-80/f5.6 versus the Sony 24-70/f4.0?

Hi Henry,

I understand how the Oly 12-40mm is equivalent to 24-80mm in 35mm terms because of the 2x crop factor of the micro 4/3 sensor. But AFAIK, the aperture remains the same.

Aperture is the same.

Think of it this way:

A fat lady and a thin supermodel are laying on the beach. Who will get sun burnt faster? Answer: both will burn/tan the same despite the fat lady having 4x the skin area. This is because they both have the same exposure. Anyway, Four Thirds is the hot supermodel.

F/2.8 is the same for a Nikon 1, an RX100, the E-M1 and the A7.

f/2.8 = f/2.8 = f/2.8 across formats - same exposure. WE AGREE. You see? BUT THE NOISE LEVELS ARE NOT THE SAME.

Yes, and you know noise levels are NOT 2 stops different and dynamic range is NOT 2 stops different for these cameras.  Dynamic range is about 1/2 stop for the majority of ISOs DxO tested.

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