B00BKUZ5UE Bower SLY358OD Ultra-Wide 8mm f/3.5 Fisheye Lens for Olympus 4/3 Digital Cameras

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Dramatic 180 Degree field of view
High index, low-dispersion multi-coated optical glass to reduce flare
Minimum Focusing Distance of 11 inches (27.9cm)
Groups/Elements: 7/10
Angular Field (APS-C): 140 Degree Diagonal