very useful focal range ; good resolution in the frame centre at all focal lengths ; proper correction of coma at longer focal lengths ; moderate vignetting at longer focal lengths ; slight astigmatism at longer focal lengths ; good performance against...

weak image quality on the edge of the frame at all focal lengths ; high lateral chromatic aberration near the maximum relative aperture of 200-300 mm focal lengths ; significant barrel distortion at the wide angle and distinct pincushion in the 35-100...