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Get flash to fully experience Pearltrees
We've got a downloadable lens calibration chart to make this easier. The lens calibration target is easy to set up and use with an LCD monitor. It's important to realise that any system of parts with individual tolerances can exhibit significant variance if the assorted 'errors' all stack up in one direction (they can just cancel out too). This is a key element of engineering design for manufacturing. Whilst expensive lenses and an expensive camera should 'just work' there may be room for improvement.

