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>>117500 well yes; there are two types of them. circular and diagonal.
circular on a FF creates a circlular image one the sensor that covers 180o in all directions across any point. of course this leaves a large portion of black around the edges though...
the other is diagonal which creates a FF image that covers the entire sensor but the only direction it creates a 180o image in is diagonal and not quite 180o side>side or top>botttom.
generally longer fisheyes; 10, 14, 15mm fisheyes are diagonal while wider ones; 4.5, 5, 8mm are circular.
hope that helps.
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