It's an expensive professional camera. In the above sentence, expensive and professional are opinion adjectives. So, why does expensive go before professional? Thank you!
'Expensive' is an opinion. What is expensive to one person is not necessarily to another. It is related to perceived value.
Adjectives of opinion always go first. A popular guide to order of adjectives (represented by the mnemonic OpSAShCOMP) suggests:
Opinion: pretty, horrible, lovely Size: huge, tiny, big, little Age: old, young, new Shape: round, square, triangular Colour: black, red, yellow Origin: British, Chinese, French Material: woollen, wooden, silk Purpose: writing (paper), school (shoes)
So, for example, you might have an expensive new Japanese camera.