Zeiss Tessar

I saw Carl Zeiss Tessar 2.8/4.5 mm lens, what does "2.8/4.5" mean?

I have Nokia 6500s. One characteristic is Carl Zeiss Tessar 2.8/4.5 mm lens. I felt a lil concern is, what do those numerical figures. (the 2.8/4.5). TQ!

Like most phones only have a digital zoom my guess is that this refers to the opening of the lens and fixed focal length lens, so it is a aperture of f2.8 with a focal length 4.5 mm. No, I know the sensor size of camera phones, so I can not say what he refers to conventional cameras.

Zeiss Tessar

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