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Uses of Iris Blades ?

Ram Nanda

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Apart from shape of bokeh, what are the pros and cons of having more iris blades ?

Cooke S7i (image circle 46.3 mm)         - 9 blades

Zeiss CP3 (image circle 46.3 mm)         - 15 blades

Zeiss Supreme (image circle 46.3 mm) - 16 blades

Arri Signature (image circle 44.7 mm)   - 11 blades

Leica Thalia (image circle : 60 mm)         - 15 blades

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