Crop Factor: Why you multiply the aperture by the crop factor when compa... http://www.reddit.com/r/photography/comments/21j2el/crop_factor_why_you_multiply_the_aperture_by_the/

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Field of View in Full frame vs. Crop Sensor Cameras: Please keep in mind that not all crop sensor DSLRs have the same size sensor. The crop factor on APS-C crop sensor DSLRs from Pentax, Olympus, Sony, and Nikon is 1.5. The crop factor for most Canon DSLRs is 1.6x. That means that if you take an 18mm lens and put it on a Canon and Nikon, the Canon picture will be slightly more zoomed in. ***

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Crop Sensor These markings tell you that they’re built for a smaller camera, with a smaller sensor and you’ll find that the focal length has also been adjusted accordingly. It also means that the projection from the lens is much smaller and will not work on a full frame camera; if you were to put it on a full frame camera, it would produce very heavy vignetting.

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Crop-Factor explained: Black – Full Frame Red – 1.3x Crop Factor Yellow – 1.5x Crop Factor Green – 1.6x Crop Factor from: http://digital-photography-school.com/crop-factor-explained

The subject of sensor crop factors and equivalence has become rather controversial between photographers, sparking heated debates on photography sites and forums. So much has been posted on this topic, that it almost feels redundant to write about it again. Sadly, with all the great and not-so-great information out there on equivalence, many photographers are …

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