For the person who ended up here on my site after looking for camera shop utrecht, I can’t help too much with the bigger fancier stores, but there’s a lovely little one on Lange Jufferstraat, near Café de Stad. It’s got some lovely old cameras on display in the window, along with various odds and ends. They also develop film and sell frames and such. Probably not what you’re looking for, and you probably won’t be back here to see this, but maybe someone else will be curious about this kind of thing in the future.
Those of you looking for the Utrecht red light district are on your own, though.