Change Lenses in bolex

[Fawzi Darwish]

what should i do when change the lens is the light will burn the film when changing ?

[Simon Wyss]

Vague double question

See that the spring is tensioned, mechanism STOP. Now the shutter shuts all light from the lens port, you can swap lenses safely. With an EBM model the mechanism comes to an undefined halt. An EL always stops shutter closed.

[Arthur Sanchez]

Not if there is still some crank remaining or the shutter is closed.