I will be using photoshop to create a photo of my friends Mike and Jim with their favorite drinks sitting at the same table.
Jim is visiting this week and has an expensive bottle of scotch.
Mike is visiting next month and will be bringing an expensive bottle of Whiskey.
The photo will contain both items and persons despite the fact both people and items never existed in the same room at the same time.
I just have an average smartphone, and no tripod.
The plan is to use a tape measure and ensure the table+chairs is in the exact same location for both photos, to limit the work done on photoshop and make the resulting photo look more realistic.
I could attach a string to my smartphone and measure the bottom of the String from the walls
But I don't know how to get the exact angle. I could buy a cheap tripod, but I don't know if the angle of the smartphone would be exact. I'd also like to save a few bucks if this is possible without a tripod.