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How to clean your camera lenses (and check for problems)
How to Research Lenses Online Before Buying
Buying a cheap or expensive lens?
Buying a good used camera lens.
Six Tips to Mastering Your Lens
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Lens Chart
Photographycamera lens (photographic objective/photographic lens) is a curved piece of glass device that when attached to either a digital or 35mm camera that focuses the image onto either the film or the CSMOS. Lenses come in a variety of sizes, quality and price.
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Photography Buying Guide Glossary Equipment Repair Education
Normal-This is the lens that most retailers sell along with the body of the camera. The most commonly sold are the 50 mm. They have an f-stop range of between f/1.2 to f/2.8. ( some are faster but more expensive)
Wide Angle-This lens are usually between 20 mm to 28 mm. They are used to take pictures with a large number of subjects or scenic views. They have a wide depth of field.
Zoom-This lens has a range of focal lengths you can use to move from one type of lens to another. You can have a wide angle, normal and telephoto lens all in one package.
Telephoto-This lens is used to photograph a distant subject such as a bird. They bring the subject closer to you like a telescope. They can run to over 500 mm
Macro-This lens is used to photograph near small objects such as a flower or insect. They have a very narrow depth of field.
The focal length is the distance between the center part of the lens and its point of focus on the subject.
An excellent addition to any lens system is a teleconverter, sometimes called teleextender.
This handy device fits between the body and the lens and doubles or triples the focal length of the lens.
For example a 50 mm lens becomes a 100 mm lens. Its easy to install and saves a lot of room in the gadget bag.
Read more at:
Gizmag-Lens Guide
* A TTL system will automatically adjust to the teleconverter.