Panasonic Lumix G 42.5mm f/1.7 Review

Panasonic LUMIX G 42.5mm f/1.7 ASPH Performance

At f/1.7 sharpness in the centre of the frame is already outstanding, and clarity towards the edges of the frame is very good. Stopping down improves performance across the frame, with sharpness reaching outstanding levels across the frame between f/4 and f/8. 

MTF @ 42.5mm

How to read our charts

The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Averaging them out gives the red weighted column.

The scale on the left side is an indication of actual image resolution. The taller the column, the better the lens performance. Simple.

For this review, the lens was tested on an Olympus OM-D E-M5 using Imatest.

Chromatic aberrations are extremely well controlled with fringing remaining well under a quarter of a pixel in width across the frame, and at all aperture settings. This extremely low level of fringing should be difficult to spot, even in large reproductions of images, or harsh crops from the edges of the frame.

CA @ 42.5mm

How to read our charts

Chromatic aberration 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 an Olympus OM-D E-M5 using Imatest.

Falloff of illumination towards the corners is well controlled for a fast aperture standard lens. At f/1.7 the comers are 1.33 stops darker than the centre of the image and stopping down to f/4 results in visually uniform illumination across the frame.

Distortion is very well controlled. Imatest was only able to detect 0.114% barrel distortion. This low level of distortion should pose few issues and the distortion pattern is uniform across the frame, which should make applying corrections in image editing software afterwards, relatively straightforward.

A circular hood is supplied with this lens, which does a good job of shading the lens from extraneous light that may cause issues with loss of contrast or flare. Even without the hood in place, this lens is very resistant to flare and contrast levels hold up well when shooting into the light. 

Value For Money

Currently, this lens is available for around £350. The closest equivalent available is the Olympus 45mm f/1.8 lens, which costs almost half as much at around £180. As this lens lacks optical stabilisation, it will be a harder deciding between the two lenses if you’ve a Panasonic, or other MFT camera that lacks in-body stabilisation. If you have an Olympus camera body, it’s a bit of a no-brainer of a decision.

For those who find f/1.7 simply isn’t fast enough for them, there is also Panasonic’s 42.5mm f/1.2 lens to consider, although this lens costs around £1199.

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