Bought because of the name of the brand, it does the job with a Nikon 1 V1 but I think it would be very limited with a big DSLR equipped with a heavy optics. The instruction is in English on the back of the box, very readable. The positioning mark is opposite the symbol "S" preceding Drift on the upper movable plate ... not very clear at first if we threw the box. The positive; minimum space, operation without problems for now.