App? Formula?

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Domip

Hi to all,
Does someone knows if an app exists, or a formula that can tell wich lens you must/can use, when only a certain surface (3x3meters) at an certain distance (2,8meters) is known? Sometimes a client asks me if I can photograph a painting in a constrained space, like the example given...

NickT

I've locked this as it is a duplicate of another thread.
Nick-T typing at you from Flexframe's secret location under a Volcano