I think CH brought up the fact that distortion of some lenses change with
focussing distance. I had not really considered this before but I can see
how it might happen in lenses with internal focussing (e.g. Zuiko 18/3.5)
where the lens groups move relative to each other. The question is, for
lenses which focus using movement of all elements as a unit can you still
observe the distortion changing with distance ?
...Wayne
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