Not sure if this is the tight place to post this, but as the title, it seem to fit.
Bought a Galaxy S3 late last month and have been trawling for free apps (as you do) and came accros Helicon Remote (as mentioned previously). For the sake of £1.20 for a OTG adaptor lead, I thought it was worth a play - the lead was on the door mat when I got home this eveing.
Samsung Helicon 7D by Trugga, on Flickr
Not had a full play with it yet, but it does appear to operate the camera (a 7D). Not sure where I'll be using it though, perhaps it could be useful for astrophotography, although I do want to try the macro stacking tool.
For £1.20 I'm happy.
will check it out