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The Complete Idiot's Guide® To Photography Essentials by Mark Jenkinson

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Chapter 2
Exploring Photographic Optics
Now let’s look at the specifics of the lens you’re using. Before you go any further, it’s a good idea to fully understand the advantages and disadvantages of your lenses and how different lens use will affect your photos. So, let’s look at the different types of lenses and figure out what you can and can’t do with the ones you have.
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A Nikon camera with a 50 mm lens.

The 50 mm Normal Lens

If you own a 35 mm film camera, then it probably came with a 50 mm “normal” lens. This lens has a lot going for it, such as being probably quite fast—f/2.0 (meaning it has an f-stop capability of 2.0, which we’ll discuss ...

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