I am not sure sure which way to go with this. I am trying to lay out the Min. Expense to do this. I have a Sony Laptop I can use or Buy a Tablet/ or ?? instead. I have the Cable for the camera to tether( Hasselblad H4D-40 ) I will be using Phocus Software Also and IMAC Computer. if you can recommend where to purchase them NEW or USED. I won't be using it a lot just occasionally . Thank you,