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<blockquote data-quote="Bengt Nyman" data-source="post: 476665" data-attributes="member: 13692">Trying to summarize the above discussion including essential facts while avoiding common misconceptions is probably a dangerous task, but I will try.1. All 300mm lenses (as an example) have the same physical, optical focal length of 300mm, whether designed for format 1, FF or larger.2. All 300mm lenses are NOT designed with the same FoV (Field of View) but are designed so that the image circle covers the native sensor diagonal.3. Using a non-native lens, the result is determined by the size of the image circle in relation to the sensor diagonal.4. If the image circle is larger than the sensor diagonal (FX lens on DX body) the image sensor will crop the image, throwing away some image, some light and aperture, and part of the capability of the lens. 5. If the above cropped image contains more pixels than doing the same amount of post cropping of that image captured in Full Frame, you might have a quality image that looks like it was taken with a longer lens.6. The optimum is always to use native combinations of camera and lens, when available.</blockquote>

[QUOTE="Bengt Nyman, post: 476665, member: 13692"] Trying to summarize the above discussion including essential facts while avoiding common misconceptions is probably a dangerous task, but I will try. 1. All 300mm lenses (as an example) have the same physical, optical focal length of 300mm, whether designed for format 1, FF or larger. 2. All 300mm lenses are NOT designed with the same FoV (Field of View) but are designed so that the image circle covers the native sensor diagonal. 3. Using a non-native lens, the result is determined by the size of the image circle in relation to the sensor diagonal. [COLOR=#000000]4. If the image circle is larger than the sensor diagonal (FX lens on DX body) the image sensor will crop the image, throwing away some image, some light and aperture, and part of the capability of the lens. [/COLOR] 5. If the above cropped image contains more pixels than doing the same amount of post cropping of that image captured in Full Frame, you might have a quality image that looks like it was taken with a longer lens. 6. The optimum is always to use native combinations of camera and lens, when available. [/QUOTE]

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