Lens knowledge what should I pay attention to when changing lenses for SLR cameras?

SLR camera, lens replacement is a compulsory course. Not only outdoors, but also at home.

First of all, prevent wind and sand, try to leeward, and the bayonet of the fuselage should not face the sky.

Secondly, prevent raindrops (including spitting)

The impact of the third line of defense, the damage of bayonet and rear lens are irreversible, so we should concentrate.

Finally, prevent falling and drowning, because proficiency will be taken lightly. Once it landed, it not only broke the lens, but also broke the little heart.