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what do numbers on 35 mm nikon camera lens mean?
I am confused by what all the numbers mean on a 35 mm nikon camera lens .. for example . .Nikon mount 28-75 2.8 tamron lens .. what do all the numbers mean and what is the difference .. this is very confusing .. thank you
OK I'll break it down for you, and I'll try to explain everything
So lets hold up our imaginary lens, the Nikon Mount 28-75 2.8 made by Tamron:
Nikon Mount: the technical name for this is called the "F-Mount" and has been in use by Nikon for many years, so you can get great deals on used older lenses
28-75: That is the "focal range" of the lens (in terms of millimeters). It is telling you how wide the pictures can be (28 mm in this case) and how zoomed in they can be (75 mm). Of course, that means that, on this particular lens, you can take pictures anywhere between 28 and 75 mm.
2.8: that is called the "ƒ-stop". This part is a little counter-intuitive, but the smaller the number, the bigger the aperture hole is. The aperture hole is what controls light amount of light entering the camera. So a little ƒ'ing math:
ƒ2.8 will let in more light than ƒ4, and ƒ4 will let in more light than ƒ5.6
However, there is a catch: the smaller the ƒ-stop is, the amount of the picture that will be in focus drops off quickly. So on a picture shot at ƒ2.8, there will be a very Shallow Depth of Field
[example: http://en.wikipedia.org/wiki/File:Shallow_Depth_of_Field_with_Bokeh.jpg ]
On the flipside, a picture shot at ƒ32 will have a much bigger Depth of Field [example: http://en.wikipedia.org/wiki/File:Jonquil_flowers_at_f32.jpg ] <-- that is the 28-75 tamron lens, but on a canon instead.
Tamron: the lens maker.
Hope that helps a little bit 
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