Re: (Rumor) A6700 on July 12th...does anyone care?
Uncle Chip wrote:
What happens when you focus the light, the image circle for a full frame lens is much bigger than it is for a m4/3 lens, the more you focus the light the brighter it gets, so the same lens with a f4 aperture designed for a ff camera will not give the same exposure as the same lens designed for a m4/3 camera, the image circle is a quarter of the size
This is why Panasonic advertise their lenses with 2.8 when they are actually a 5.6, because exposure wise they give you 2.8
No, the aperture of a lens is a geometric feature of the lens alone, and its f-stop value a property of the lens alone and is thus independent of sensor size. 600mm is 600mm and f/4 is f/4 no matter the sensor size or crop in post. Cropping doesn’t alter the aperture, and sub-ff sensor sizes can be thought of as mere cropping.
May 31, 2023 at 07:31 PM
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