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Fujinon XF 90mm f/2 R LM WR ( Fujifilm ) - Review / Test Report - Analysis |
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Lens Reviews -
Fujifilm X
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Page 2 of 3
Distortion
The produced distortion of the Fujinon is marginal at just ~0.3% (pincushion-style). This applies both to auto-corrected images as well as uncorrected RAW files.
Vignetting
The vignetting is low for such a high speed lens. In JPEG mode, we measured a light falloff of merely 0.4EV (f-stops) at f/2 which is nothing really. This increases slightly to 0.7EV when doing a RAW conversion although the difference may relate to a slightly different tone curve here. Even so 0.7EV is barely an issue and it's gone from f/2.8 onward. Regarding the excellent vignetting characteristic we are a little bit wondering whether this lens actually covers much more than just the APS-C image circle ... just to fuel the full format or (or APS-H) rumors a bit. ;-) This would also explain the comparatively big dimensions of the lens.
MTF (resolution)
The resolution characteristic of the Fujinon is highly impressive. It's tack sharp from f/2 to f/5.6 and that's across the image field. The peak performance is already reached at f/2.8. Diffraction starts to kick in at f/8 with a higher impact at f/11. The quality at f/11 remains usable though.
The centering quality of tested sample was Okay. The field curvature is very low.
Please note that the MTF results are not directly comparable across the different systems!
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
Imatest Explanations
Chromatic Aberrations (CAs)
The lateral CAs (color shadows at hard contrast transitions) are very low with an average pixel width of 0.2-0.3px at the image borders. This is negligible.
Bokeh
A key feature such a large aperture lens is the rendition of out-of-focus areas aka the "bokeh" and we are generally impressed here. The final bit of creaminess may be missing but general out-of-focus blur is very smooth both in the focus front- and background.
Out-of-focus highlights are rendered nicely at f/2 although there's the odd deterioration towards "cat eyes" towards the image borders. In inner disc is smooth and there's only a slight outlining. Fujifilm claims to have incorporated rounded aperture blades. However, honestly speaking that's not obvious from the sample crops below. An edgy aperture shape is already slightly visible at f/2.8 and more so at f/4.
Bokeh Fringing
Bokeh fringing is an axial color fringing effect. It can show up as purple halos in front of the focus point and greenish halos in the background. Just like most of ultra-large aperture lenses the Fujinon is also affected but not overly so. There are only traces at f/2 and f/2.8.
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Move the mouse cursor over the f-stop marks below to observe the respective LoCAs
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| f/2 |
f/2.8 |
f/4 |
f/5.6 |
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