LYCOS RETRIEVER 
Lens: Miscellaneous
built 621 days ago
If the black outer rim on the lens base is solid all around the lens (no meter coupling ridge) you know it definitely is a Non-AI lens. Nomenclature on the lens may help .... If the lens designation contains a letter or two letters, it denotes the number of elements. See chart above.
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A lens which deviates the path of a ray so that it is deflected more toward the optic axis is a converging lens. Such action makes converging rays more convergent. It makes diverging rays less divergent. It may, if strong enough even make diverging rays non-divergent (parallel) or even convergent. Likewise a diverging lens can make diverging rays more divergent, converging rays non- convergent, or even divergent.
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The front lens is the slightly bulkier AF-S version, while the more svelte older version is in the rear. The apparent length difference is mostly an optical illusion--standing on end they're nearly identical in length. Note the longer lens hood and wider focus grip of the AF-S version.
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These lenses are very flexible and are often the most comfortable lens to be worn initially. While very safe to use, these lenses are often disposable to decrease risks of complications, such as infection.
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The X-Loupe PRO comes in 60X, 100X and 150X lens, and you could get it with the Canon IXUS online for US$1449. Not bad for something that could be used both for creative and educational purposes.
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