Panasonic Lumix S 100 mm f/2.8 Macro review

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Panasonic Lumix S 100 mm f/2.8 Macro

20 October 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

The images below clearly show that the Panasonic under review has no significant problems with coma. The image of the LED is barely distorted at all, and the only noticeable effect is a slight enlargement of the image in the extreme corner of the full-frame area.

Centre, f/2.8	APS-C corner, f/2.8	FF corner, f/2.8

Centre, f/4.0	APS-C corner, f/4.0	FF corner, f/4.0

To provide a more complete picture of the Lumix's performance in this category, we also decided to present crops of the night sky taken from the upper-right corner of the full-frame area. This time, however, we show images captured at f/2.8, f/4.0 and f/5.6. The star test proved somewhat more demanding, revealing traces of coma occurring mainly at shorter wavelengths and therefore manifesting themselves as a blue glow that stretches the image towards the edge of the frame.

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FF corner, f/2.8	FF corner, f/4.0	FF corner, f/5.6

Astigmatism, defined as the mean difference between the horizontal and vertical MTF50 values, measured 5.6%. This result lies on the borderline between very low and low levels, so the lens under review deserves praise in this category as well.

The Panasonic S 100 mm f/2.8 Macro delivers average-looking out-of-focus images. The presence of as many as three aspherical elements has resulted in a fairly pronounced onion-ring bokeh effect.

As for mechanical vignetting, we have a pleasant surprise here. The lens's compact dimensions and fixed-length design suggested that serious problems might occur in this respect. However, this aberration disappears completely as soon as the aperture is stopped down by 2 EV.

Centre, f/2.8	APS-C corner, f/2.8	FF corner, f/2.8

Centre, f/4.0	APS-C corner, f/4.0	FF corner, f/4.0

Centre, f/5.6	APS-C corner, f/5.6	FF corner, f/5.6