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Panasonic Leica DG Vario-Summilux 25-50mm f/1.7 ASPH Review - Performance

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Panasonic Leica DG Vario-Summilux 25-50mm f/1.7 ASPH Performance

At 25mm, central sharpness is excellent at f/1.7, outstanding from f/2 to f/5.6, excellent at f/8 and still very good at f/11 and f/16. The edges are very good from f/1.7 right through to f/8 and good at f/11 and f/16. Diffraction on the smaller format means that apertures such as f/22 have been wisely avoided.

At 30mm, central sharpness is excellent at f/1.7, outstanding from f/2 through to f/5.6, excellent at f/8 and good at f/11 and f/16. The edges are very good from f/1.7 through to f/8, good at f/11 and just fair at f/16.

At 40mm, central sharpness is excellent at f/1.7, outstanding from f/2 through 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 through to f/4, very good at f/5.6 and f/8 and good at f/11 and f/16.

At 50mm, central sharpness is excellent at f/1.7 and f/2, outstanding at f/2.8, excellent from f/4 to f/8, very good at f/11 and good at f/16. The edges are excellent from f/1.7 to f/5.6, very good at f/8 and f/11 and good at f/16.

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This is an excellent overall performance, and it is very commendable to see how the performance is maintained even at the longer focal lengths, where many zoom lenses start to falter.

 

Panasonic LEICA DG VARIO-SUMMILUX 25-50mm f/1.7 (H-X2550) 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 and sharpness 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. Want to know more about how we review lenses?


CA (Chromatic Aberration) is well under control, either with good lens design, with corrections in-camera that we cannot switch off, or a combination of the two. Either way, this is fine as the end result is a clean image with virtually no colour fringing. It does give way a little at the edges at 50mm, but it is unlikely to be noticed on most subjects.

 

Panasonic LEICA DG VARIO-SUMMILUX 25-50mm f/1.7 (H-X2550) 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 is amazingly low and it is quite likely that here too there are corrections being made that we cannot switch off. The lens is virtually rectilinear, but we can measure distortion figures of +0.08% pincushion at 25mm, +0.08% pincushion at 30mm, +0.04% pincushion at 40mm and -0.01% barrel at 50mm.

Bokeh, the quality of the out of focus areas in an image, is actually rather pleasant, with nice, smooth gradation. This works well for any subject matter where an out of focus background is needed to complement the subject.

Flare is well controlled in this lens, rather better than its sibling of two years ago. In general use, even with quite severe backlighting, there was little sign of any loss of contrast.

Vignetting may also enjoy some correction that we cannot see as the figures are very low for a zoom lens.

Aperture 25mm 30mm 40mm 50mm
f/1.7 -1.4 stops -0.9 -1.3 -1.2
f/2 -1.3 -0.8 -1.2 -1.1
f/2.8 -1 -0.6 -1 -0.9
f/4 -0.9 -0.6 -0.9 -0.9
f/5.6 -0.9 -0.6 -0.9 -0.8
f/8 -0.9 -0.6 -0.9 -0.7
f/11 -0.9 -0.5 -0.9 -0.7
f/16 -0.8 -0.5 -0.9 -0.7


Panasonic LEICA DG VARIO-SUMMILUX 25-50mm f/1.7 (H-X2550) Sample Photos

 

Panasonic LEICA DG VARIO-SUMMILUX 25-50mm f/1.7 (H-X2550) 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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