Sigma 20mm F1.8 EX DG Aspherical RF
Wideangle prime lens | Canon EF, Nikon F (FX), Pentax KAF, Sigma SA Bayonet, Sony/Minolta Alpha
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I'm wanting to buy a lens for full frame Nikon at 20mm or slightly wider. I can't justify high expense - £300 absolutely maximum, so that excludes latest Nikon 20mm 1.8 and Sigma Art 1.4. One option is a Sigma 20mm f/1.8 EX DG but I can't work out if there have been a non aspherical and an aspherical version of this lens. Looking at the photograph on one retailer here it doesn't say Aspherical on the lens, like it does on the Photographylife database here But on an eBay listing here it...
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