All examples are on the full-frame Nikon D3. Most images can be clicked to see a larger version and/or actual-pixels crops. Mouse-overs are also in place on this page for all of them.
The Nokton 58/1.4 and the Ultron 40/2 both have 9-bladed apertures that appear almost perfectly circular to the eye. No doubt this contributes to their pleasant out of focus rendering.
The comparisons on this page all match aperture eg f/1.4 for both the 58mm f/1.2 NOCT-Nikkor and the Nokton 58mm f/1.4. Because blur characteristics are most prominent at the widest aperture, f/1.4 is used for most of the examples. The NOCT-Nikkor can blur even a little more at f/1.2 of course.
Note that the actual focal lengths differ slightly, and thus the pairs of images don’t match precisely in size. In addition, vignetting is less at f/1.4 with the NOCT-Nikkor because it has been stopped down by 1/2 stop. The NOCT can be expected to have smoother image rendition by virtue of a more circular aperture as compared with the Nokton, which will be partially vignetted by the lens barrel wide open at f/1.4.
Article continues for subscribers...
If you’re already a subscriber, CLICK HERE TO LOG IN
diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.