Sigma apo EX / EX DG IF Macro 180mm F3.5 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
Sigma 180mm macro, both of them
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Amazon.com : Sigma 180mm F2.8 EX APO DG HSM OS Macro for Canon SLR Cameras : Camera Lenses : Electronics
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Sigma 180mm f/3.5 EX DG lens - Wikipedia
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Amazon.com : Sigma 180mm F2.8 EX APO DG HSM OS Macro for Canon SLR Cameras : Camera Lenses : Electronics
Sigma apo EX / EX DG IF Macro 180mm F3.5 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
