03-30-2015, 05:28 PM
The entrance pupil on this one is 17.5mm, as compared to the 9.8mm entrance pupil on the typical 18-55. It also focuses internally and features a better stabilizer. All of the zoom motions must also happen in front of the aperture stop, placing further restrictions on the design, while having a wider zoom range (4.3x vs 3x).
The performance is poor and it is expensive, but this thing is much more complicated than the standard 18-55.
The performance is poor and it is expensive, but this thing is much more complicated than the standard 18-55.