Panasonic Lumix G 45-150mm f/4-5.6 OIS - Review / Test Report - Analysis
Lens Reviews -
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The distortion characteristic is very moderate. There is only a marginal amount of barrel distortion at 45mm and slight pincushion distortion at 100mm and 145mm. The difference between native and auto-corrected distortion is rather negligible.
Vignetting is a bit of an issue (~0.9EV) at the extreme ends of the zoom range at max. aperture. However, this can be resolved by closing the aperture by about a stop.
The resolution measurements came as a slight surprise. Affordable tele lenses tend to get weaker towards the tele end whereas the Panasonic is capable of keeping a very even performance across the range. The center quality is generally very good followed by just marginally worse borders/corners. Diffraction decreases the performance from f/11 onward but this is physics and thus unavoidable.
The centering quality of the tested sample was good for an image stabilized lens.
Below is a simplified summary of the formal findings. The chart shows line widths
per picture height (LW/PH) which can be taken as a measure for sharpness.
If you want to know more about the MTF50 figures you may check out the corresponding
Chromatic Aberrations (CAs)
The CAs (color shadows at hard contrast transitions) stay below 0.5px at the image borders so this isn't overly relevant anymore from a user perspective.