You can custom-program up to four controls of your choice, as well as an additional setting on a function button atop the camera. If that's not enough customization for you, you can save your preferred camera setup to one of two "My Modes" that are quickly accessible on the program dial. While the control buttons on the back of the camera are small and closely spaced, their action is stiff enough that we almost never made an inadvertent setting.
The GX100 uses an unusual, hybrid autofocus that combines TTL focusing on the CCD with an external passive AF sensor. It focuses quickly and accurately, so much so that we never needed the AF assist lamp, even in very dim lighting. The camera also has very short shutter lag. Bursts? It can capture highest-quality JPEGs at 2.5 frames a second -- no slouch there -- but it punks out at five frames.
The GX100 can capture JPEGs, as well as (three cheers!) simultaneous JPEG and RAW files. Its RAW format is Adobe's DNG, so if you have Photoshop, you can open and adjust the pictures with no further ado. Be warned, though, that RAW + JPEG capture is slow: The first frame will take about 4 seconds to process, and subsequent frames only get slower. Not the setting for action shots!
The GX100 is a highly competent camera that's easy and fun for both the casual shooter and the serious enthusiast to use. We like it. But we'd like it more if it cost a little less and had less noise at high ISOs.

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