Trying to Choose New Camera and Lenses: Sony NEX vs Olympus OM-D

Started Jan 24, 2013 | Questions thread
Everdog
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one error.
In reply to goetz48, Jan 26, 2013

goetz48 wrote:

The aperture of a lens is always caltulated by dividing focus length through opening diameter. And that does not change with the cropping factor. A 50mm/1.8 always remains a 1.8 regardless of using a FF, APS-C or a 3/4 sensor.

Since having a FF lens on a camera with APS-C sensor means just waising light cought by the lens and not used by the sensor. So a third party companiy did now develop a lens adapter for NEX cameras that concentrate the light to the sensor and therefore increase the aperture by one step by reducing the crop factor to 1.

They are also making it for M43 cameras too.  So far the reports are it causes vignetting on APSC cameras like NEX, but not M43 for some reason (smaller image circle?).   Here is a thread about it.

http://connect.dpreview.com/forums/post/50688709

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