Difference between Samyang 7.5mm and Samyang 8mm on an APS-C sensor camera

The following two images illustrate the two fish eye lenses on Sony cameras with an APS-C size sensor (for example the Sony ILCE-6000 or the Sony ILCE-QX1). To get these kind of images on an APS-C sized sensor you have to shave the lenshood of the Samyang 7.5mm.

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