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Pentax-03 Fisheye 3.2mm f/5.6 (Pentax Q) - Review / Test Report - Analysis |
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Lens Reviews -
Pentax Q
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Page 2 of 3
Distortion
Our analysis tool does not like the extreme distortion characteristic of fisheye lenses so we just show you the result.
Distortion is not a bug but a feature on a fisheye lens so it is rather pointless to come up with distortion numbers anyway.
Vignetting
It is not possible to test the light falloff of fisheye lenses ... nor is it really relevant. Any vignetting will visually disappear in the results anyway.
MTF (resolution)
The Pentax Q camera has a very small sensor so you can't expect the same pixel-level sharpness like in other mirrorless or DSLR systems.
Additionally it has an "early" aperture where diffraction effects reduce the quality of the results ... and the Pentax 03 3.2mm f/5.6 Fisheye runs straight into this limitation. The image quality is rather mediocre but there's at least no major drop across the image frame.
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)
Lateral CAs (color shadows at the image borders) are very pronounced and will be visible in most scenes with an average CA pixel width of 2px at the image borders. While this isn't overly surprising on such a lens it further decreases the quality perception of the already weak optical performance.
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