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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Alex Notpro
Alex Notpro Contributing Member • Posts: 982
MFT 25mm f/1.4 fails to blur background like Full Frame 50mm lens @ f/2.8
4

I've been wanting to get rid of redundant photo gear, so today I decided to do a quick test to see if there was really that much difference between FF and mFT in the 50mm FOV. I was expecting to find equivalent results at f/2.8 on FF versus f/1.4 on mFT. However, that's not what I found.

I'm slightly baffled by this, as "equivalence" theory says these two photos should result in the same DOF and background blur. However, the full-frame 50mm shot at f/2.8 clearly out-blurs the background versus the Micro Four Thirds 25mm lens shot at f/1.4.

Just for kicks I also attached the shot with the full-frame lens at f/1.4, which I expected to look different from mFT @ f/1.4, but wanted to see just how different it would be.

Micro Four Thirds 25mm @ f/1.4

Full Frame 50mm @ f/2.8

Full Frame 50mm @ f/1.4

Does anybody have a rational explanation for the difference in background blur between the MFT/25/1.4 and the FF/50/2.8 shots?

 Alex Notpro's gear list:Alex Notpro's gear list
Leica Nocticron 42.5mm Sony FE 35mm F1.4 Sony Alpha 7 Sony a5100 Panasonic Lumix G Vario 7-14mm F4 ASPH +17 more
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