* * * Same point 1: The lens structure is the same. The lens of the same model is installed in different ways, but the structure is the same.
* * * Similarity 2: The effect of the lens is basically not too bad. I have never seen a report that different bayonets will get different effects.
Difference point 1: the flange distance of the lens is different, that is, the image field of the lens is different.
Difference 2: The relative position of lenses, especially the relative position of the rear group of lenses, will be different.
Difference 3: This is the biggest reason why the lens drive circuit is different, the contacts are different, and the SLR is not universal.
Difference 4: whether there is anti-shake will be different, such as Longteng 70300USD, Nikon Canon bayonet with anti-shake and Sony bayonet without anti-shake (because it is not needed).
In fact, someone has made a circuit-driven adapter chip. I have seen someone use Sony's NEX camera, which can completely drive the video of Canon's AF lens (made in China) through the switching circuit. Maybe one day there will be a universal camera that can break the bayonet difference.