EF vs EF-S
AlephNull wrote:
Both EF and EF-S lenses show their focal length in terms of full-frame 35mm, not "effective" or "crop factor" terms.
not quite. Focal length is a property of the lens. It has nothing to do with the sensor. 50mm simply means an infinity light source will focus at 50mm behind the lens (simplistically speaking - but think magnifying lens, trying to light a piece of paper). Anyway, the sensor size behind the lens then dictates the field of view/angle of view that you get. For historical reasons, the 35mm FF format is taken to compare field of view/angle of view. Having said that, lenses are of course designed to cover a certain image circle. The EF-S lenses are designed to cover only APSC, EF cover FF, the TS lenses have an even larger image circle, so probably could be used on medium format (that's why they are TS, so the image circle can be shifted off the optical axis and still cover the sensor).
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Canon EF 100-400mm F4.5-5.6L IS II
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