Sigma C 18-300 mm f/3.5-6.3 DC MACRO OS HSM
7. Coma, astigmatism and bokeh
| Nikon D7000, 18 mm, f/3.5, center | Nikon D7000, 18 mm, f/3.5, corner |
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| Nikon D7000, 50 mm, f/4.8, center | Nikon D7000, 50 mm, f/4.8, corner |
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| Nikon D7000, 100 mm, f/5.6, center | Nikon D7000, 100 mm, f/5.6, corner |
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| Nikon D7000, 200 mm, f/6.3, center | Nikon D7000, 200 mm, f/6.3, corner |
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| Nikon D7000, 300 mm, f/6.3, center | Nikon D7000, 300 mm, f/6.3, corner |
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The astigmatism, understood as an average difference between vertical and horizontal MTF50 values, is very low in the 18-200 mm range, reaching just 3.6%. That aberration becomes noticeable only at the maximum focal length, where it is 12%.
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The appearance of defocused images for a megazoom lens can be called sensible. Only the rim of the ring, increasingly intensive on stopping down, sticks out. The mechanical vignetting is not especially annoying because the ring is truncated in the corner only at the maximum relative aperture.
| Nikon D7000, 100 mm, f/5.6, center | Nikon D7000, 100 mm, f/5.6, corner |
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| Nikon D7000, 100 mm, f/8.0, center | Nikon D7000, 100 mm, f/8.0, corner |
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| Nikon D7000, 100 mm, f/11.0, center | Nikon D7000, 100 mm, f/11.0, corner |
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