The Olympus OM-D line of cameras first came to market in the form of the popular E-M5 back in April of 2012. Now more than 8 years later there are four distinct OM-D lines, and the first of these christened with "Mark IV branding" has just arrived in the all-new Olympus OM-D E-M10 Mark IV. The entry-level model in the OM-D line, the E-M10 IV is the last to receive an upgrade to the newer 20mp sensor, which is arguably the most important upgrade for the line in this latest revision. This is important for several reasons, primarily...
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