Micro Four Thirds Focal Reducer Shootout

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brian
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Micro Four Thirds Focal Reducer Shootout
6 months ago

Since Metabones released the first general purpose m4/3 focal reducer in June 2013 several more products have appeared on the market. To my knowledge, there haven't been any systematic high resolution comparison tests of these focal reducers, so I decided to shoot a test chart and put together a matrix of 100% crops.

The matrix below shows 100% crops from the center, left side, right side, and all four corners of test chart images taken with a 50mm f/1.4 Nikon G lens (wide open) attached to: 1) the Light Cannon by Vizelex; 2) the Lens Turbo by Zhongyi; 3) the R.J. Focal Reducer; and 4) the Speed Booster by Metabones. The test chart used is a standard Resolving Power Chart available at low cost from Edmund Optics: http://www.edmundoptics.com/testing-targets/test-targets/resolution-test-targets/resolving-power-chart/1665 .  Note that the chart illumination wasn't perfectly uniform, and was a little brighter on the right side.  In each case, focus was adjusted for maximum contrast in the center of the field.  The camera used was a Panasonic G6.

DISCLAIMER:  I'm the designer of the Speed Booster optics.

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Brian Caldwell

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