new Metabones adapter gives nex crop factor higher-quality full frame look.

El Matadurr wrote:

Okay, so I can (halfway) understand how the adapter is reducing the focal length by reverse-magnification, thus giving shallower depth of field at "equal" focal lengths comparing with the adapter and without.

However, I thought the actual LIGHT that could go through a lens was dependent on the size of the diameter of the front element divided by the focal length? This adapter isn't letting more light in...right?

Taking a supposed 10mm lens with a 20mm front element, the f-stop would be f/2. If this adapter reduces the focal length, so now the 10mm lens is now 5mm (or whatever the value is), we get 20mm/5mm, or f/4.

Then again, maybe Metabones is doing some weird voodoo after all.

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