Sony NEX-5 Flash

Sony NEX-5 Flash

Sony has made a decision in the design of its NEX-5 that's likely to prove just as divisive for the company as it was for with two recent cameras from rival Olympus. Playing up to the strengths of the single-lens direct view camera format, namely its extremely compact size and weight, Sony has forgone an internal flash strobe. Olympus followed the same route in the design of its first two Micro Four Thirds SLDs, the Pen E-P1 and E-P2, and the decision split public opinion -- not to mention causing some debate in the IR labs. On the one hand, there were those who felt that the absence of a built-in flash was a curious decision, for two reasons. It meant bringing along a bulky external flash strobe everywhere you went, if you had the least concern about ambient light conditions. Since the hot shoe shared double duty as a mount for the accessory port, it also meant that flash couldn't be used at the same time as the external viewfinder accessory. On the other hand, some observers argued that much of the time, they simply didn't need to use flash photography -- and that the ability to pare off a little more bulk from the camera was more than worth these trade-offs.

With the Sony NEX-5, those on both sides of the argument may find themselves digging trenches and preparing to escalate the battle, because new ammunition has been provided for both arguments. There are a couple of reasons for this, and they both relate to how Sony has chosen to implement external flash. Like Olympus before it, Sony has introduced a diminutive external flash strobe to accompany its NEX-series cameras. Sony's HVL-F7S flash is even smaller than that provided by Olympus, however -- and it even folds flat against the top of the lens mount when not in use. It's also reasonably powerful for its size, with a useful range extending out as far as sixteen feet. Sony officially lists the guide number as being seven meters (23 feet) at ISO 100 -- which while it's rather less powerful than the strobes on most digital SLRs (typically rated at 12 or 13 meters), is equal to the built-in strobe on the Olympus E-PL1, and actually a little more powerful than the built-in strobe of the Panasonic GF1. The folding design makes it surprisingly compact even when attached to the camera. Once safely packed in its protective plastic case, it's dimensions are barely under 2" x 1.5" x 1", easily small enough to slip in a pants pocket and forget you're even carrying it, until you have a need for it.

One could be forgiven for thinking that the compact size of the flash strobe entirely solved the problem, were it not for a couple of other features of its design. Firstly, the coverage is rather narrow, leading to pretty uneven illumination with the 16mm prime kit lens, and at wide angle with the 18-55mm zoom kit lens. The same will apply to the 18-200mm kit lens, and vignetting will likely prove an additional concern with that combination, given the modest height of the HVL-F7S strobe when extended, and the significantly larger dimensions of the lens itself. Perhaps more of an issue, though, is that the HVL-F7S is your only choice for on-camera flash, full-stop. The reason for this is that Sony's NEX-series models -- unlike every other current SLD camera -- don't include a standard flash hot shoe. Instead, Sony has instead adopted a proprietary accessory connector, shown at right above, that accepts either the HVL-F7S flash strobe, an external stereo microphone accessory, or an optical viewfinder.

A small thumb screw in the base of the strobe and other accessories allows them to be tightly fixed to the camera, safe from being accidentally bumped off, while two small pins on all the accessories mate into holes on the camera body to keep everything steadily aligned. The decision to adopt this proprietary port doubtless has helped Sony to keep the camera size and weight down, and enables the NEX-5's smooth, clean top panel (once the accessory port door is closed). Unfortunately, it also means that there's no way to mount any more powerful, third-party flash strobes on the camera, though. Nor is there any provision for bounce flash, a feature not offered by the tiny HVL-F7S strobe. Unless Sony releases a larger and more capable flash strobe compatible with the mount, or another manufacturer licenses or reverse engineers the connection, this is likely to remain the case. Given the modest size of the thumb screw and alignment pins, there's likely a fairly strict limit on the size and weight of accessory that the cameras could accept. If you're willing to accept these quirks, though -- and many photographers will be -- then there's no denying that the size of the HVL-F7S strobe beautifully complements that of the NEX-5 body.

When raised, the HVL-F7S flash stands proud about an inch above the camera's top deck, and when lowered once more, the  flash is automatically disabled. The Sony NEX-5's has six flash modes: Auto, Fill, Slow Sync., Rear Sync., and Off. Through a separate menu option, red-eye reduction can be enabled, which function by adding several bursts of preflash to contract your subjects' pupils, in addition to the regular metering and exposure flashes. Flash modes are changed in the Camera menu, Flash Compensation in the Brightness / Color menu, and Red-Eye Reduction in the Setup menu. Available settings vary depending on exposure mode. X-Sync (the maximum shutter speed with the flash enabled) is 1/160 second by default -- a bit below average these days, but identical to the X-sync speeds of the Olympus Pen E-PL1 and Panasonic Lumix DMC-GF1.

The Sony NEX-5 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.