How do scratches affect camera performance?

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The advantages and disadvantages of lens covers on camera-equipped phones is a hotly debated topic. Recent Nseries devices have seen a mix: N78, N95 8GB and N96 (no lens cover) versus N79, N85 and N95 classic (with lens cover). In the first in a series of articles on contentious camera issues, Steve looks at the question of whether scratches on the camera's protective glass really make a difference.

Moving up to the Nokia N95 8GB from the N95 'classic', I had one big worry, and only one - the unprotected camera 'glass'. As I used the phone day to day, I took to wiping it with a corner of my shirt before taking photos - after all, the glass does tend to collect dust and finger grease and this would be bad news for picture quality.

Read on in the full article.