I SLR camera did not shut down on the lens for what hurt
4 [SLR camera did not shut down on the lens] is purely dangerous operation. Should not only shut down, it is best to remove the battery and then change the lens.
3 is not a 2 times 2 times the illegal operation must encounter 'burn', but can not 'point' always 'positive' drops! 'Often in the river where there is not wet shoes', the long time the bad luck must come.
2 and the electric lens (Nikkor) there are 10 circuits connected to the 'contact' to dock with the fuselage, think about the 10 contacts in the docking process without rules action it once encountered it should not encounter Contact (potential) will be what the situation, can be imagined: burning.
1 camera body shell is generally negative grounding body, relative to many lens connection contact contact (positive) have 'potential';
