In late February, Sigma surprised us by announcing its 15mm F1.4 DG DN Diagonal Fisheye lens, an optic squarely aimed at astrophotography. Sensing an opportunity, we put the lens into the hands of José Francisco Salgado, a professional astrophotographer, just in time for a photography trip to the Canadian sub-arctic to shoot the aurora borealis. An important note about these sample photos: When shooting sample galleries for lenses, we typically keep ISO values as low as possible to prevent
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