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A quick guide on interchangeable camera lenses
Interchangeable lenses can open up a whole new world of photography. If you're new to lenses, consult our quick guide to the types of lenses available.
http://www.digitaltrends.com/photography/quick-guide-to-the-various-types-of-camera-lenses/
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DSLR Photography 101 - Instructables
So you want to take good looking pictures? All you need is a camera and something to take a picture of (which shouldn't be too hard to find). So if you have a camera and you want to start taking pictures, let's get started, shall we? (The photos of the camera are slightly lower quality, because I'm using a phone camera, and I can't very well use my nice camera to take pictures of itself, can I?)
http://www.instructables.com/id/DSLR-Photography-101/
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Photography 101: Lenses, Light and Magnification - Digital Photography School
Welcome to the third lesson in Photography 101 - A Basic Course on the Camera. In this series, we cover all the basics of camera design and use.
http://digital-photography-school.com/photography-101-lenses-light-and-magnification
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The 3 DSLR Lenses You Need (and 2 More You'll Crave) - Gizmodo
This goes out to people who bought or want an entry-level DSLR, and wonder what's the deal with interchangeable lenses. You really gonna buy that extra glass? It's a beginner's guide to growing as a photographer, preferably without going broke.
http://gizmodo.com/5331109/the-3-dslr-lenses-you-need-and-2-more-youll-crave
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Photography 101 - How to Choose a Lens
Photography tips, tricks, and tutorials for both the beginning and advanced photographer. Relevant information on both digital and film photography.
http://www.photography101.org/basics/how_to_choose_a_lens.html
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Photography 101: Learning About Your Camera's Lens - IFB
Your cameraâs lens plays a huge part in how your photos turn out - it can mean the difference between a crystal clear shot or a grainy one. To stay on top of your photography game, hereâs some insight to get the most out of your lens: Two major things you want to address when you are purchasing a lens are the maximum aperture and focal length.
https://heartifb.com/2012/08/14/photography-101-learning-about-your-cameras-lens/
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Focal Length: Understanding Camera Zoom and Lens Focal Length - Nikon
What is Focal Length? Click here to read about digital camera zoom and understand the lens focal length.
http://www.nikonusa.com/en/learn-and-explore/article/g3cu6o2o/understanding-focal-length.html
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Digital Camera lens Buying Guide: Digital Photography Review
Digital Photography Review: All the latest digital camera reviews and digital imaging news. Lively discussion forums. Vast samples galleries and the largest database of digital camera specifications.
http://www.dpreview.com/articles/9162056837/digital-camera-lens-buying-guide
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Camera Lens - Wikipedia, the free encyclopedia
A camera lens is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.
https://en.wikipedia.org/wiki/Camera_lens