Is it possible to shoot tethered (wired) with D7000 using a smartphone? if yes, which OS, what kind of features and apps are needed?
Absolutely. There is a great dongle+app, offered by TriggerTrap. I purchased it and I'm super happy with it. If I recall correctly, the app is available for iOS and Android.
Some of the free app's options are as follows:
- Simple cable release
- Press and hold
- Press and lock
- Timed release
- TimeWarp (time lapse + acceleration)
- DistnaceLapse (operates on GPS movement)
- Star trail (for exposure control)
- Sound sensor release (!!)
- Vibration sensor release
- HDR modes (including HDR timelapse)
- WiFi slave setup
May I add that it connects to your smartphone's microphone jack. Different signals are sent from your phone (as sounds, obviously), which are converted by the dongle to signals known to your camera as shutter release signals. Simple and genius.
The app is quite a piece of art, too. You get a handful of shooting modes, some of which require the shutter speed mode of your camera to be set to "Bulb Mode".
Plus, if you make sure to set your device on some sort of flight mode, then your boss's call won't mess up the time lapse you've been working on all night long.
If you had the D7100 the answer would be yes via the Nikon Wireless Mobile Utility.
Instead you could use something third party such as: Trigger Happy