I have on several occasions used screen protectors. Basically, do all what they want. Significant differences were there when applying the films, mostly in the correct orientation and in particular with the whereabouts remaining, not ausstreichbarer bubbles. This problem did not arise in the dipos film. Before pressing it could be aligned precisely, then only - "drop" and rub - as described earlier. One should just only pay attention to a previous thorough cleaning. Whether I'll ever use up to 5-pack, I do not know, but because the film will probably also fit my EOS 600, which would also be supplied. Inexpensive the set is still.