Bronica advice

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Will some one be so kind as to advise me what I should look for when looking at a Bronica 645 or sq to buy?

any thing nasty that a quick visual inspection would not show up?

light seals around the film cassette come to mind but I would not recognise if there was a problem unless obviously broken I think hence my question.

 

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I just yesterday refoamed a Mamiya 645. The old foam was working but came out in small chunks down to near dust. I would suggest lightly picking at the foam with a toothpick type of tool. If it is solid, continous, stays together, and looks good it's OK. If at all possible get a test roll of film run and look it over carefully.All of the camera system should work smoothly and evenly. Bronicas are fine instruments and you can expect it to feel like.