The first thing that I want to know with an autofocus lens is can it focus accurately and consistently?
The examples on this page assess the autofocus accuracy of the Nikon AF-S 50mm f/1.8G on the Nikon D3x. All focusing down with a single AF point in single-shot mode with focus priority.
Click each image to see the larger version along with crops.
Focus was spot-on here, and the 50/1.8G delivers outstanding sharpness in the central areas as I desired.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.