Panasonic Lumix G X Vario 12-35mm f/2.8 lens test report at Camera Ergonomics: mounted on a matching body like the GH3, it is fully capable of taking on a professional photographic role.

Panasonic Lumix G  X Vario 12-35mm  test report and review.

"Since the advent of the Micro Four Thirds format in 2008, there has been some uncertainty,  dare I say confusion, about the place of M43 in the camera world.  Some thought  it would be a platform for compact camera upgraders, some saw it as a "gap filler" between compacts and DSLR's.  I have always seen it as the format best positioned to supplant the APS-C  DSLR  as the most popular interchangeable lens system. Until now this prospect has not been realised due to a lack of sufficiently convincing M43 products. That has started to change. The Panasonic 7-14mm f4 has always been a pro

standard ultrawide  zoom but has been a bit of an orphan with no pro system to back it up. Now we have the 12-35mm f2.8, the 35-100mm f2.8 and the GH3 body forming the core of a pro standard product set within the M43 system.

The 12-35mm f2.8 which is the subject of this review is fully capable of taking on a professional photographic role. It is a highly capable and versatile lens with excellent image quality, excellent mechanical operation and no deal breaker deficits.
It is not "perfect". The edges are not absolutely sharp until f4. Bokeh is good  but not perfect.  There is no distance scale. It is a varifocal not a parfocal.  [But a parfocal version would probably be larger] There is no AF On/Off switch on the lens barrel. Oh, yes, and mine has a bit of dust inside the rear element, on the periphery, thank goodness.  But the overwhelming impression is of a highly competent lens  capable of handling any photographic task, in a remarkably compact and reasonably priced package.  With this lens and it's pro grade companions,  the Micro Four Thirds system is coming of age."

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