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p.10 #12 · p.10 #12 · Sigma 28-45mm f/1.8 DG DN Art Prime Comparison / Image Thread | |
It's going to be dependent on your tastes rather than any inherent major quality differences. The very fact that this is a zoom placed in this company should be sufficient to inform you of that. I personally prefer what I see above, so it's no surprise.
'Smoothness' is a double-edged sword - it tells you the designers and the money men behind them are working for that particular look. The alternative taken by Sigma here is very close to how Cosina design their trademark OOF transitions, which emphasises using the background to steadily fade off with great elegance.
It's much harder to achieve than to simply do a lot of early and persistent blur as subject-background distance is gained. If you rush to OOF too fast, you flatten the visual cues that provide depth perception to the image. It won't matter what your mind thinks about this, because your visual system sees it first and forms that recognition ahead of your conscious appraisal. Yes, it's science.
Believe it or not, your visual system is looking for progressive fade from sharpness, correlated with distance. Seen most clearly in the room set above (see the wall chart board, for example). Having said this much, it's obviously down to preferences. And they tend to stick in people - Leica went with the blur wall background in many older lenses and many people love it. Cosina released the 50/1 and did it their way, you can check it out here, if interested.
One approach separates the in-focus material very strongly (Sigma already do this in the 35/1.2), the other approach brings in the other image content in a progression with distance from the subject. The marketeers have sold the full bokeh look very successfully, but it runs against your innate depth perception. This zoom is a very engaging lens, with wonderful other characteristics, notably fine microcontrast and microcolor - topics for another day.
See the GM's CA also in the wood cabinet crop (both at f1.8). And the onset rate of blur showing in the device sitting on the cabinet. It's not surprising in a lens destined for weddings, events, etc. is it?
Fast lenses tend to carry their characteristics into smaller apertures, as we see here. They won't magically transform themselves. If you want image depth, stay clear of ultra fast lenses. That's also $1900 -vs- $1340, with 170 grams different weight. Just pointing that out. The zoom obviously has great crop potential at its long end, making it an effective, say, 28-55mm or more, depending on standards and end use.
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