Tamron 18-400 mm f/3.5-6.3 Di II VC HLD
Of course any demanding fan of photography would spot the flaws of the tested lens. If you prefer good image quality across the frame and a better, more efficient autofocus unit it would be more sensible to divide the 18-400 mm range into two lenses.
Very universal focal range; Good image quality in the frame centre; Proper correction of longitudinal chromatic aberration; Lack of problems with spherical aberration; Sensible coma correction at the shortest focal length; Low vignetting at longer focal lengths; Efficient image stabilization
Weak image quality at the maximum relative aperture on the edge of the frame and across the whole focal range; High level of lateral chromatic aberration at 50 and 400 mm; Significant distortion at 18 mm and in the 35-100 mm focal range; A bit too high astigmatism; Slow autofocus which needs further...