MFT 25mm f/1.4 fails to blur background like Full Frame 50mm lens @ f/2.8

Started Feb 16, 2014 | Discussions thread
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David Kieltyka
David Kieltyka Veteran Member • Posts: 4,687
Re: MFT 25mm f/1.4 fails to blur background like Full Frame 50mm lens @ f/2.8

Steen Bay wrote:

According to DxO the t-stop of the 25/1.4 on E-M1 is 1.7, but not quite clear whether that affects the DoF too.

It doesn't. DOF is affected by the actual aperture diaphragm diameter rather than the light transmission characteristics of the lens. I've observed this many times in actual use with fast lenses.

-Dave-

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