The slight corner softness is mostly gone. You can easily use the lens at f/2.8 here. Unsurprisingly, the results are better on pixel level due to the reduced pixel density. Not everybody is using a high megapixel body so let's have a look at how the results turn out at 30 megapixels. If you want to know more about the MTF50 figures, you may check out the corresponding Imatest Explanations MTF (resolution) at 30 megapixels The chart shows line widths per picture height (LW/PH) which can be taken as a measure of sharpness. Please note that the MTF results are not directly comparable across the different systems!īelow is a simplified summary of the formal findings. Our sample had a slight centering issue which prevented better results at f/2.8. f/16 remains usable but you should stay clear of f/22. Diffraction has a limiting effect from here on albeit you won't really notice it at f/8 yet. The peak performance is reached at f/5.6 with a great center and a very good to excellent outer image field. Stopping down to f/4 has a fairly substantial impact lifting the borders/corners to very good levels. The outer image field isn't quite on this level but still manages to achieve good marks. The center resolution is already great at f/2.8. The resolution characteristic is pretty impressive. Stopping down reduces the issue but it's a gradual process and there is still some light falloff (~0.8EV) present at f/8. At f/2.8 there is some visible light falloff albeit it's far from being excessive at ~1.5EV (f-stops) in the full format scope. The vignetting figures are in line with what you can expect from such a lens. With respect to image distortions, the Laowa 90mm f/2.8 2x Ultra-Macro APO has no issues - at all. Due to the lack of electronic coupling, the Laowa lens has to rely on its original capabilities regarding distortion, vignetting and CAs.
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