Nikon offers the WU-1b as a companion wireless adapter for the D600, which works with WMAU (Wireless Mobile Adapter Utility) on the iPhone to allow remote shooting. The app works well, but it is also extremely limited in what it can do, making you constantly wonder what it could have been.
The adapter itself is minuscule, only 3 grams and roughly the size of the flash shoe. It offers about 2 hours of battery life on the camera when you have live view on all the time, which means that it will last long enough for occasional use.
The interface is utterly frustrating. When you have live view on your device active, you cannot change any setting at all, neither on the device nor on the camera. The only thing you can do is tap on the screen to initiate focussing. This works, and is invaluable when you need to place your camera in odd places, but it could be so much better. Given Nikons history of artificially limiting their firmware ( bracketing comes to mind), I suspect they want to protect their PC remote program. But they should really keep in mind that this is future: Who wants to carry a laptop when an iPad mini can do the job just as well?
Macro/still images when shooting from odd angles
In practice I found it much less useful than I hoped for. Having a remote screen makes adjusting the camera easier, but you really would like to have both hands free for this. Here a Glif for your iPhone together with a GorillaPod will help.
Once the camera is positioned right, I was annoyed by the lack of feedback and manual control in the app. There is no ability to zoom the display to check on focus, and test photos download slowly, in like 10 seconds, so using this for your checks instead is also frustrating. I cannot change any camera settings remotely, tap to focus is supported, but no sign of manual focus adjustments, aperture or exposure compensation. And when you change a setting on the camera, you cannot simply do it, you need to first leave the remote view in the app.
Shooting wildlife and children
Sometimes your presence behind the lens will disturb your subject, for this a remote release can be great. This one has a problem: it is slow. Slow to update the remote view, you can have delays of up to 200ms, and slow to focus, as you only have contrast autofocus available, which can take a second. But with a static camera you will already be focused on a specific location, so in practice the update delay is most annoying. But you will also run into the problem that the Nikon mirrors are loud; a mirror less camera would be much better for this.
Self portraits
Tap to focus makes it quite easy to set the correct focus point, and with the human face having enough contrast, the camera will lock on correctly. And the live view makes it much easier to position yourself correctly for the shot. As you will do a few test shots anyways to get the composition right, it is much less annoying to have to change settings on the camera. Overall finally a niche where the adapter is enjoyable to use.
Improvements I’d like to see
As it is the adapter has too many little flaws to recommend it unless you really need the remote live view to help with composition. What I would like to see in the future:
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Higher speed
Slow live view updates and low download speeds are a constant irritation.
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Better remote focus support
The lens has an autofocus motor, this should be used to do remote manual focusing. And add the manual focussing aids: highlight the focus area in the image, and allow us to zoom the remote view
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Remote settings updates
Modern cameras have become quite complicated computers, and we do not need all settings remotely, but please provide the important ones: aperture, exposure compensation, ISO sensitivity, flash exposure compensation and shutter speed.
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iPad support
Especially with the mini out now, it would be great to able to use the larger display.