Sigma 15mm F2 8 EX DG Diagonal Fisheye Bewertung | 54 Daten im Vergleich

The Sigma 15mm F2.8 EX DG Diagonal Fisheye lens delivers mixed results for astrophotography, earning a 75% reader rating primarily due to its optical flaws. On the positive side, the lens is notably small and lightweight, weighing only 338 grams (12 oz) with the caps removed, and it features a fixed plastic lens shade. However, the reviewer found the lens disappointing for its $609 USD price tag. A major physical drawback is its incredibly short barrel height of 68mm, which caused the reviewer's dew strap to overhang and accidentally block the extreme corners of the images during testing. Optically, the lens suffers from severe "coma" distortion that causes stars away from the center to appear triangular at every focal ratio tested, from f/2.8 up to f/5.6. Testing also revealed typical chromatic aberration, heavy vignetting, and a distinct loss of sharpness toward the edges of the frame when shot wide open. While stopping down the lens to f/4 significantly improves the vignetting, the triangular coma distortion remains a persistent issue. Because of these severe optical defects and high cost, the reviewer...

The Sigma 15mm f/2.8 EX DG Fisheye is a compact, attractively priced full-frame lens that provides a distinct 180° diagonal field of view and delivers strong performance. Image quality is a major highlight, with MTF data showing good overall sharpness and excellent resolution figures between f/5.6 and f/16. While designed for full-frame bodies, it can be used on cropped APS-C sensors, though the signature, heavy barrel distortion remains highly visible on both formats. The lens has notable pros, including its high image quality, excellent value, solid performance, and an aperture scale lock for Nikon bodies. However, it also presents distinct cons regarding handling and design. It lacks a focused-distance window, features minor chromatic aberration, and suffers from slight softness in the far corners. Crucially, its non-internal focusing (non-IF) mechanism forces the user's hands to stay clear of the moving focusing ring during autofocus, creating a risk that wandering fingers might accidentally intrude into the ultra-wide 180° frame.