What is the difference, other than iFn, between NX 50-200mm I, II and III?

Started Mar 12, 2013 | Questions thread
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Michael Barker
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What is the difference, other than iFn, between NX 50-200mm I, II and III?
Mar 12, 2013

I would be interested to know if there are differences between the different 50-200mm versions, in optical performance, OIS performance, AF performance.

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Pentax K-30
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