Posted 20 hours ago

Sigma 322965 85mm F1.4 DG DN | A For Sony E, Black

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The virtually complete absence of axial chromatic aberration around edges in front of and behind the point of focus is particularly impressive. Wide open with the sun in the corner just outside the frame one can catch a rainbow artefact which disappears already at f/1.

However, they were almost more trouble than they were worth, especially to any photographer who expected primes to be a portable, lightweight alternative to their big heavy full-frame zooms. However the Sony has even nicer bokeh to my taste, with some undercorrected SA and less optical vignetting. I would find the Canon 135mm f2 much, much more useful and the results much more beautiful; but them I'm biased - the Canon 135 has a very strange, magical ability to make people look wonderfully present and human.However (and, I hope, obviously) I don't want to use a fraction of my lens over a fraction of my sensor, nor do I want to move backwards to a sensor that only intercepts a fraction of the light the lens brings to the focal plane; rather, I want a lens that is engineered well enough to work properly in the high contrast circumstances that astro entails.

More uncommonly there’s also a locking switch that enables you to lock the aperture ring in its auto setting, so that aperture is controlled from the host camera and you can’t jog the aperture ring accidentally. Full-time manual focus override is also available at any time simply by rotating the focus ring when using Sony's DMF focus mode. The overall aim is not only to deliver exceptional sharpness and contrast, but also to minimize both lateral and axial chromatic aberrations.

This is even more impressive when you consider how massive the Sigma’s predecessor was ( Sigma 85mm f1. If you think the Sony is more contrasty but the Sigma has higher resolution then that distinction needs to be spelled out, because resolution without contrast will never shine in a print. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations. Within this construction are five special low-dispersion (SLD) glass elements, one aspherical element at the rear of the lens group and four high refractive index glass elements to minimise chromatic aberration, flare and ghosting.

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