It's a bird

by Vian Esterhuizen

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PB-6 has more tolerances for more mounting rings, especially if one has to use old metal converters on medium and large format lenses. PB-4 can also mount those manual converters but for some tight angles may interfere with free movement of the bellows. PB-6 design is more accommodating. That is the response I got when I asked a true expert, an expert who ...

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