Yet the number of all those possible photos is not infinite. Therefore, if the universe / space is infinite, it can only be due to repetition since the number of unique things that can exist is apparently finite. — Zelebg

The 'apparantly leaves you a lot of swing room. I think your argument makes sense, if the building blocks and rules and so on can't be different in other parts of the universe. I don't think this is an argument against infinity, but an argument against one kind of infinity: and infinity of different things. The infinite universe would have to repeat. But the repeating does not negate its infinite volume, for example.