Hi I'm contemplating a panoramic camera which is dual format, made by this Chinese company. I have a couple of questions which perhaps members will answer. Do Gaoersi have strap lugs on the cameras? Is 120 film loading quick in the field? Is the speed of operation about the Same as a fuji g617? What is the durability of the film mask, inside the chamber? Is the helical focusing easy? Can they be handheld? How do these compare to fotoman or art panorama?