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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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Steen Bay
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Re: MFT 25mm f/1.4 fails to blur background like Full Frame 50mm lens @ f/2.8
In reply to Joe Pineapples, Feb 16, 2014

Joe Pineapples wrote:

Some sensors show a strong fall-off in response to light rays incident at large angles off-axis, resulting in an effective aperture for the lens + sensor combination that is less than the geometrical optics aperture of the lens alone. I've no idea if this is significant in the effect you are seeing...

Joe

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"Well, it's too late to die young now..."

Yes, it could theoretically be the 'f-stop blues' :

http://www.dxomark.com/Reviews/F-stop-blues

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. Also possible that the E-M1 image is a bit back-focused.

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