How to mount/unmount Speed 4 lenses

Insert trasparent lens just starting from bottom, hook the nose before taking care of the lens teeth entering the edge of the mask concealed PVC: then put on the whole circumference of the mask.

Then for the last hook in the top, taking care to find housing of the teeth to release the neutral lens, always start from the bottom: careful not to break the tooth.

Attention: Never put in contact in the neutral lens Pc of Speed 4 with acetate overlens when wet: it forms a chemical reaction and electrolysis that scratched both.