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20mm f1.7 vs 40mm 2.8 vs. 75mm f1.8 DOF/Bokeh/Perspective Comparisons: Micro Four Thirds Talk Forum: Digital Photography Review
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File:Micro Four Thirds Olympus E-P2 with Panasonic Lumix G 20mm F1.7 ASPH aspherical pancake lens.jpg - Wikimedia Commons
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