OM SYSTEMOlympus LH-49 Sliding Hood for M.Zuiko Digital ED 60mm 1:2.8 Macro Lens

Is it metal or plastic?

Will the STF-8 attach without issue with the lens hood in place?

Does it come with a cap?

Can the hood be extended (at least partially) while using the stf-8 macro flash? does the hood rest in position if only partially extended? thank you.