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Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Lens Review - Performance

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Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Performance

At 10mm, central sharpness is excellent at f/1.7, outstanding from f/2 to f/4, excellent at f/5.6 and f/8, very good at f/11 and still good at f/16, although diffraction at this point is taking a firm hold. The edges are very good from f/1.7 to f/5.6, good at f/8 and f/11 and only fair at f/16.

At 12mm, central sharpness is outstanding from f/1.7 to f/5.6, excellent at f/8, very good at f/11 and good at f/16. The edges are very good from f/1.7 to f/5.6, good at f/8 and f/11 and fair at f/16.

At 18mm, central sharpness is outstanding from f/1.7 to f/5.6, excellent at f/8, very good at f/11 and good at f/16. The edges are excellent from f/1.7 to f/4, very good from f/5.6 to f/8 and good from f/11 to f/16.

At 25mm, central sharpness is outstanding from f/1.7 to f/4, excellent at f/5.6 and f/8, very good at f/11 and good at f/16. The edges are very good from f/1.7 to f/8, good at f/11 and just fair at f/16.



 

Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH MTF Charts

How to read our MTF charts

The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges.

The scale on the left side is an indication of actual image resolution as LW/PH and is described in detail above. The taller the column, the better the lens performance.

For this review, the lens was tested on a Panasonic Lumix G9 using Imatest.

 

CA (Chromatic Aberration) is very well controlled centrally, a little less so at the edges. However, this is an excellent performance and there is very little to disturb us by way of colour fringing. Any residual CA can, of course, be corrected using software.

 

Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Chromatic Aberration Charts

How to read our CA charts

Chromatic aberration (CA) is the lens' inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.

For this review, the lens was tested on a Panasonic Lumix G9 using Imatest.

 

Distortion measures -1.43% barrel at 10mm, changing to minimal pincushion at 12mm (+0.09%), 18mm (+0.05%) and 25mm (+0.03%). So, mild barrelling at the widest angle, something we are quite used to in lens design, moving to an almost perfectly rectilinear lens by 25mm.

Bokeh, the quality of the out of focus areas in an image, it is more the forte of telephoto lenses than wide-angle ones, but given that here we have such a fast maximum aperture there are possibilities. Bokeh is very satisfactory and the f/1.7 aperture does give us some potential to explore it.

This is, of course, quite a complex lens, so the multi-coatings used are of paramount importance. Although in most images there is no problem with flare, with strong backlight, especially with a bright light source in frame, there is. Low contrast, streams of light rays and other artefacts are the order of the day. Of course, equally well there could be some images where such “defects” actually become desirable, but that is an aesthetic decision for the photographer.

Vignetting at 10mm shows -1.3 stops of corner darkening at f/1.7, reducing to -0.8 stops by the time we reach f/4. This is maintained throughout the rest of the aperture range.

Vignetting at 12mm is similar, starting off at -1.4 stops at f/1.7, reducing to -1.0 stops by f/5.6. Results at 18mm and 25mm are the same.

Technically, this is a very impressive lens, with just a bit of a flare problem in extreme conditions.


Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Sample Photos

 

Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Aperture range

You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.


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