![]() ![]() The critical focus transition zones are very smooth at max. Out-of-focus highlights are very uniform and perfectly circular till f/5.6. The bokeh (the quality of the out-of-focus blur) is a primary aspect for a macro lens and the Canon lens does truly shine here. At 100% magnification you may spot this but it shouldn't be a problem on prints. Lateral CAs are generally well controlled with around 1px on the average at the image borders. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. Please note that the MTF results are not directly comparable across the different systems!īelow is a simplified summary of the formal findings. f/22 is a no-go - the diffraction characteristic of an APS-C body is not as favorable as on full format DSLRs here. However, the lens remains easily usable at f/16. Starting from f/11 onwards there's the general decrease in quality due to diffraction effects. ![]() The borders are slightly worse but still easily on a very good level in this range. The center quality is excellent straight from f/2.8 till f/8. The resolution characteristic of the Canon L lens is very impressive in the APS-C scope. ![]() However, the problem is already negligible from f/4 onwards. in a scene with clear sky, you may be able to spot this. The amount of vignetting is still comparatively high at f/2.8 though. The lens enjoys the usual sweet spot advantage when used on an APS-C DSLR. The chart above has a real-world size of about 120x80cm. Interestingly the APS-C figures are slightly worse (if we can speak of "worse" on this level) compared to the full format test so there seem to be some marginal distortion in the inner image field which are corrected beyond again. Typical for most macro lenses the level of distortion is negligible and nothing to worry about. ![]()
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