There are 2 reasons:
1. miggo connects to the tripod socket at the bottom of your camera. Each camera has a different build which requires a different connection solution to miggo, even when the tripod socket isn't in the standard place.
2. We designed the miggo connector plate to enable suitability to cameras with lenses of various lengths – from very short ones to zoom lens. In any case, we always recommend measuring your camera to guarantee compatibility before ordering.