Hermione says in Goblet of Fire:
‘All those substitutes for magic Muggles use – electricity, and computers and radar, and all those things – they all go haywire around Hogwarts, there’s too much magic in the air.'
Goblet of Fire - pages 475-476 - Bloomsbury - chapter 28, The Madness of Mr Crouch
and in Chamber of Secrets Colin Creevey says this:
‘[A]nd a boy in my dormitory said if I develop the film in the right potion, the pictures’ll move.’ Colin drew a great shuddering breath of excitement and said, ‘It’s brilliant here, isn’t it?'
Chamber of Secrets - page 75 - Bloomsbury - chapter 6, Gilderoy Lockhart
How is it that Colin Creevey's Muggle camera works properly at Hogwarts and on the Hogwarts grounds? Further, how is it that a magical potion could create moving pictures from Muggle film, which only takes one-framed (for lack of a better description) shots at a time?
I'm assuming Colin's camera is not digital, as this is 1991 (first expensive DSLRs appeared in 1991), plus Colin, obviously, references film.