I am soon going to be trying out an Alpa STC camera, and am debating whether to use a viewfinder versus my iPhone as a composition aid. I have downloaded the Artist's Mark II Viewfinder on my iPhone, which really is a great tool. I wanted to ask what other Alpa users how they are mounting their phones, or is it easy enough to use handheld? Alpa has a great looking iPhone camera mount accessory, but it costs about $800 dollars. Is it worth it, or are there other alternatives to mount an iPhone?