Panasonic GX1 Flash

Panasonic GX1 Flash

The Panasonic GX1's built-in flash has a Guide Number rating of 7.6 meters (24.9 feet) at ISO 160. With the 14-42mm kit lens, that translates to a range of 7.1 feet at f/3.5, or 4.5 feet at f/5.6. The GX1 doesn't offer an ISO 100 setting, but since most cameras don't provide an ISO 160 guide number, it's worth noting that its flash offers a strength equivalent to 6 meters at ISO 100. That's much weaker than most digital SLRs, which are typically rated at 12 or 13 meters, but not unusual for a compact system camera.

The Panasonic GX1's flash is released by pressing the Flash Open open button on the rear of the camera. Raising the flash enables it. It never pops up automatically like some models, which can be good or bad, depending on your point of view. A novice would probably appreciate an auto-pop-up flash, but someone with experience might think it a nuisance.

When open, the flash doesn't extend very high, so at wide angle longer Micro Four Thirds lenses could cast a shadow when the lens hood is attached. The Panasonic GX1's flash is disabled by pressing down until it clicks shut.

The Panasonic GX1's built-in flash has seven modes: Auto, Auto with Red-Eye Reduction, Forced On, Forced On with Red-Eye Reduction, Slow Sync, Slow Sync with Red-Eye Reduction, and Forced Off. Flash modes are changed via either the Quick menu, or an option on Page 2 of the Record menu, and available settings vary depending on exposure mode. The flash is forced off when closed. A Digital Red-Eye Reduction feature is also offered, which when enabled, will attempt to remove red-eye after the photo is taken, via post-processing. For slow-sync exposures, both first and second curtain synchronization modes are provided. X-Sync (the maximum shutter speed with the flash enabled) is 1/160 second, a bit below average these days, and there is no mention of a higher-speed FP (focal plane) mode. There's also no wireless flash support in the Panasonic GX1.

The Panasonic GX1 allows you to adjust flash and ambient exposure independently of each other, by providing flash exposure compensation between -2 and +2 EV in one-third EV increments. Flash exposure bracketing is not supported, and there is no manual flash mode where output level can be set as a percentage of full power.

Like an SLR, the Panasonic GX1 also has a dedicated hot shoe for mounting external flash units, like Panasonic's DMW-FL500, FL360, and FL220. Olympus flash units such as the FL-50, FL-36, FL-20, and FL-14 should also work, and non-dedicated units can also be used provided they have a compatible trigger voltage and polarity. (Panasonic does not seem to mention the trigger voltage or polarity in the GX1's user manual, though they do warn against using an external flash with "high-voltage" or reverse polarity.)

The advantages of a good external flash are many: more power for increased range, faster recycle times, longer battery life, reduced red-eye, auto zoom to match coverage to the current focal length, and the ability to adjust the tilt and swivel of the head to allow light from the flash to be bounced off nearby surfaces such as a ceiling, for a diffuse effect. Most external flash units have a more powerful AF assist illuminator built-in than the one on the body, and other useful features such as modeling flash are common on higher end models.