I was marked wrong for 'lovely camera', which is in British usage exactly the same as 'nice camera', in fact more likely to be used.
I just added it, it should be accepted now. Thank you for your input. ^.^
Marked wrong for giving your own model answer!
Έγραψα A nice camera, αλλά ήταν λάθος. Γιατί;
How about "What a nice camera!"
"A beautiful camera!"?