Very pleased
I’m the owner of Nikon D750 and some lenses I was quite suspicious about the performance of some of my lenses . Luckily I found Focal . I installed it on my iPhone and I connected my camera through a lightning to usb cable . I had first to my format my card because there was no sync . When I connected it was very easy to follow the steps and make the adjustments . I printed the target on a normal A4 paper and stick the paper to a hard piece of plastic I had . Voila !