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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Hi, I'm new to photography and I've recently purchased a sony a5100 with two kit zoom lenses (16-50mm and 55-210mm). I would like to add a fast (not too expensive) prime lens to my set that would be good for indoor low light conditions.  I'd like to compare the sony zeiss 24mm f/1.8 sonnar (e-mount) lens with the Sigma 20mm f/1.8 EX (used with a sony a-mount to e-mount adapter). Price is important to me too so I'm looking at purchasing the Zeiss lens used or the Sigma lens and adapter new so...
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