Please note - I am a novice with no darkroom experience and in the process of setting up a darkroom. I read that a acquiring a grain focuser is a good idea. I am currently on a trip back to the States and I took the opportunity to purchase this Magna Sight focusing aid on e-bay (see image). How can I tell if it is functional? I do not have access to an enlarger right now. The mirror is in pretty good shape. But when I look through the sighting mechanism I see an opaque slightly bluish screen. I don't see the mirror. Is this normal? Item can be returned to seller.
