Circular fisheye: Sigma DC EX 4.5mm f2.8 EF mount: Micro Four Thirds Talk Forum: Digital Photography Review
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Sigma's Fisheye Duo; The Sigma 4.5mm f/2.8 EX DC HSM & 10mm f/2.8 EX DC HSM (Motor-In) Lenses | Shutterbug
Circular fisheye: Sigma DC EX 4.5mm f2.8 EF mount: Micro Four Thirds Talk Forum: Digital Photography Review
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