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Sigma 4.5mm f/2.8 EX DC HSM circular fisheyeCurrently, Sigma offers a couple of interesting extreme wide angle lenses-4.5mm f/2.8 EX DC HSM circular fisheye lens and the AF 8-16mm f/4.5-5.6 DC HSM lens, both of which are readily available to photographers right now.MSRP of $1,100.
