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photo:mftstd

25mm "standard" lenses for Micro Four Thirds

introduction

  • There are a number of 25mm-30mm lenses for Micro Four Thirds system which give the full frame “50mm standard lens” field of view
  • not compared below is the Olympus mZD 25mm f/1.8 ($AU430), the Sigma 30mm f/2.8 ART and Panasonic 30mm f/2.8 OIS macro ($AU399)
  • in addition, there is the Four Thirds lens - the superb, expensive ($AU1799), heavy (510g+adapter), discontinued Panasonic Leica D 25mm f/1.4 which requires an adapter, has slower CDAF, close focus only 0.38m, 0.5% distortion, 1.1EV vignetting wide open, 62mm filter thread and 78mm long + adapter.
  • note the DxOMark scores cannot be compared with full frame systems as different sensors and measurements are used, but a similar table for 50mm full frame lenses on hi res cameras is here, but these at f/1.4 will give you around 1.5EV shallower DOF but note that these high quality f/1.4 50mm full frame lenses are twice the weight and will only close focus down to around 0.45m - the Olympus gets down to twice as close and is much better suited to street photography given the lower weight and size!

comparison of AF lenses

Olympus mZD 25mm f/1.2 Panasonic Leica DG 25mm f/1.4 Panasonic 25mm f/1.7
price $US1199/$AU1599 $US599/$AU659 $AU290
weathersealing Yes No No
MF clutch Yes No No
weight 410g 200g 125g
length 87mm 55mm 52mm
filter 62mm mm mm
diaphragm 9 7 7
close focus 0.195m 0.3m m
dXoMark score 26 27 24
sharpness wide open 62% accutance centre, 59% at edge 63% accutance centre, 48% at edge N/A
sharpness at f/1.8 78% accutance centre, 60% at edge 73% accutance centre, 54% at edge 63% accutance centre, 54% at edge
transmission wide open T1.8 T1.8 T2
distortion 0.2% 1.6% 1.2%
vignetting at f/1.8 0.8EV (1.2EV at f/1.4) 0.9EV (1.2EV at f/1.4) 1.4EV
lateral CA at edge at f/1.8 8micron 10micron 20micron
shallow DOF 2/3 EV better 1/3 EV better base level
bokeh nice
long. CA minimal
coma near zero
AF fast issues on Olympus
comments cheap, light, lots of flare, vignetting, not as sharp, best at f/2.8-4
photo/mftstd.txt · Last modified: 2017/04/28 00:47 by gary1