Olympus Digital Zuiko 35mm f/3.5 macro - Review / Lens Test Report - Analysis
Lens Reviews - (Micro-)Four-Thirds

Distortion

The Zuiko produces only a slight amount of barrel distortion (~0.8%). Technically this isn't really anything to worry about but it's a bit more pronounced compared to other macro lenses.

Vignetting

The amount of vignetting is pretty much negligible even at max. aperture. Regarding the edge shading of only 0.3EV @ f/3.5 it's viable to assume that the lens covers somewhat more than just the four-thirds image field.

MTF (resolution)

The resolution characteristic of the lens is generally on a very high level. At f/3.5 the quality is very good across the whole image frame. Stopping down improves the results till reaching the peak performance at f/5.6 with an excellent center resolution and very good(+) borders and extreme corners. Typical for four-thirds level diffraction effects decrease the global quality from about f/8 onwards. f/11 does still provide a pretty decent quality whereas f/16 should be generally avoided due to a more pronounced global softness. Please note that f/11 is equivalent to f/22 on full format DSLRs so the depth-of-field is actually pretty big at this setting.

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 are very well controlled. An average CA pixel width of less than 0.5px at the image borders is not really field-relevant.




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