RiceHigh's Pentax Blog: Comparing the Optical Formulae of DFA*70-200 F2.8 Vs FA*80-200 F2.8

Friday, March 18, 2016

Comparing the Optical Formulae of DFA70-200 F2.8 Vs FA80-200 F2.8

19 Elements in 16 Groups; Source: Ricoh Imaging

16 Elements in 13 Groups; Source: Bdimitrov's K-mount Page

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