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I haven't used a prime (fixed focal length) lens for some time now. Some people often herald the benefits of prime lenses over more conventional zoom lenses. Ok, zoom lenses used to be a rarity but it has been the norm for some time now. Old 35mm cameras such as the Yashica FX-3 SLR that I had, came with prime lenses - usually 50mm. 50mm lenses (35mm equivalent) are often called normal lenses because they generate images that generally look natural to an observer under normal viewing conditions. By the way, that's the Wikipedia description.
The Nikon or should I say Nikkor AF-S 35mm f1.8 lens is a normal lens when paired with a Nikon DSLR with an APS-C sensor (non full-frame sensor). Nikon DSLRs such as my D60 have a cropping factor of 1.5. So, a 35mm lens on these cameras is equivalent to ~50mm (i.e. 35mm x 1.5 = 52.5mm) on a 35mm / full-frame camera.
I decided on this lens for three reasons. First and foremost, I wanted a fast lens for low light photography. A fast lens is one with a large aperture (small f-stop number). There is a good article on Digital Photography School about fast lenses if you'd like to know more - click here. I've tried photographing kids indoor with my zoom lens and unless I use a flash or really bump up the ISO (which results in noisy pictures) the images usually turn out soft because the shutter is too slow. With a large aperture, I figured that I'd be able to use a faster shutter speed and avoid soft images. While I have found this to be true, the large aperture also results in a very narrow depth of field and you have to be careful when focusing to ensure sharp images.
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joel@shutteria.com
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