I just found what looks like a promising new tool for helping people select new lense purchase. It’s a fancy web application that allows you to compare crops taken with different lenses at selected focal lengths and apertures.
ISO 12233 Lens Test Chart 100% Crop Comparison Tool
While the choices are limited right now it does confirm what I thought about a couple of lenses I own, the 50mm 1.8 lense is damn sharp for the price!
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