What do you mean by not hitting the board for the whole picture in photography?

Some lenses have large bottoms, and the probe is too deep into the fuselage after modification or transfer. When the mirror is lifted, the edge will rub against the joint of the lens or get stuck directly, which is called "collision plate".

In general, the phenomenon of plate beating rarely occurs in non-full-width machines, and it is easier for full-width machines to plate, because the reflector of non-full-width machines is larger, and the reflector of non-full-width machines will be retracted for a short distance and then lifted.

Lycra r head is hard to say, but basically, the wider the angle, the easier it is to have a "big ass" and the easier it is to hit the board.

Don't think about Lycra M head, more than 90% is impossible to install.