JonPB
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Not sure if this was of interest to anyone, but I thought I'd share a few of my samples since I had already taken the images.
Two weeks ago I did a basic comparison of my R lenses and found that they were all pretty good with subjects at about 30 and 2 meters, each lens with its own strengths. So, here's a test of bokeh at 35mm to help me see how each point is rendered. The Elmarit 35 is fantastic. The 28-70 is the next best, with smooth bubbles though a bit of coloration. Although the 21-35 has less coloration, it also has some swirly bokeh due to astigmatism and a fine-pattern onion to its bokeh. The 35-70 is the worst; even wide open, the aperture blades still reduce it to a hexagonal shape, and there's a bit of onion in there. Still, the 35-70 only shows weakness in the strongest of specular highlights; otherwise, it is very smooth.
These same basic traits are similar at 28mm, 50mm, 70mm, and 90mm, for my other lenses.
All taken on my NEX-7 with Rayqual adapter, so these should be comparable to midzone performance on an a7R. Wine glass lit by strobe in dim room, so the lighting is equivalent between shots. Clockwise from top left: 21-35, 28-70, 35-70, 35. All wide-open except the 35, which was set to f/4; slight variations in aperture are apparent. The 35's much larger bokeh in the background image is simply due to its much closer minimum focus distance.
Focused at infinity.
Focused at MFD, not using the macro setting of the 35-70:
My personal conclusion: The primes will be dedicated to wide-open shooting. The 28-70, distortion and coloration notwithstanding, is a respectable "bag of primes," including its bokeh. The 21-35 is only slightly larger than a prime and I'm happy with it for wide-angle work. I think, though, that the 35-70 will be my go-to lens. It falls apart at the extremes but most situations it handles well to very well. I prefer 28 over 35 generally, but having macro available without having to change lenses is worth it to me. The real test will be how much that green fringing shows up in actual shots; this axial CA is one of my pet peeves, and it seems stronger than I'd like here, but there's only one way to find out how it affects practical shooting.
Cheers,
Jon
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