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| p.2 #3 · Bokeh: 85mm 1.4D vs 105mm f2DC vs Sig 85mm 1.4 vs 105mm 2.8 VR |
FWIW, my favorite portrait primes are the Sigma 50 f/1.4, Nikon 85 f/1.4, and the 2 Nikon f/2 DC lenses. I use them on both DX and FX. For straight headshots, the 135 and 105 are usually my choice.
With regard to your statement about the 85 being too close to 50, I suppose that it depends on your style and taste, but I use the 85 a lot more than the 50, on either DX or FX formats.
I've seen a lot of posts saying that 135 is too long on DX. I don't agree with that notion. Again it depends on personal taste, but lots of folks like to use the 150 Sigma and most everyone goes gaga over the 200 f/2 for portraits. So, I don't get the contradiction. The 135 f/2 is approximately 200mm effective, and the 105 is approximately 150mm effective on DX sensors. I love the look and especially the way the lenses draw the subject and bokeh, from both DC lenses.
Of course, the 85 f/1.4d was legendary, called the cream machine by many users, for many years. I've not tried the new 1.4g nor the Sigma 85 f/1.4, simply because I'm more than satisfied with the old version.
Lastly, I'm in agreement with all of the others in saying that the corner performance just isn't important to me, for any of my portraits. I don't need nor want sharp corner or edge performance in portraits. I want people to look at my subject, not at anything that might be a distraction on the edge/corner.
Your budget restraint is going to dictate pretty much the lens you buy and even the Sigma 85 new price is beyond $800 at $900 on Amazon. Both DC lenses and the Nikon f/1.4d are well beyond that for new prices. I'd guess that you're pretty much limited to a used Sigma 85 f/1.4 or a used Nikon 85 f/1.4d as your choices. I suspect that you'd be happy with either one, once you get it mounted and start taking photos with it.