The word "unique" means that there is only one of them.
Words tend to have broader meanings, so, according to a dictionary:
• being the only one of its kind; unlike anything else:
original and unique designs• particularly remarkable, special, or unusual
In this case, I would say it was used in its second meaning. It is the design that is unique (i.e., special, unusual, among other cameras/designs), not the camera itself. Note that the dictionary's own example uses a plural for "design"... if "unique" would only mean "the only one of its kind", than the only proper combination would be "unique design", not "unique design
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Slobodan
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