4
3
2
1
b. Blocking
Prerequisite
The lens must be centered.
Take the posiblock adapted tothe shape, indicated at the bottom right ofthe screen: or .
Place the posiblock on the pad and press firmly, with the self-adhesive face upwards and tabs towards the left.
Remove the film from the self-adhesive face.
Lower the tube.
Position the posiblock within the boundary of the tube designed for this purpose.