Panasonic Lumix G Vario 100-300mm f/4.0-5.6 Zoom Lens

Panasonic Lumix G Vario 100-300mm f/4.0-5.6 Performance

At 100mm and maximum aperture, sharpness is excellent in the centre of the frame and approaching good levels towards the edges. Stopping the lens down a stop or two improves sharpness across the frame, until f/8. Here the clarity across the frame is good with the centre remaining excellent.

At 200mm, the clarity in the centre of the frame drops a little, but the sharpness towards the edges catches up. At maximum aperture sharpness in the centre is very good, and good towards the edges of the frame. Peak quality across the frame is reached at f/8, where the sharpness across the frame is excellent.

As is typical with zoom lenses, quality drops off a little more at maximum zoom, but at f/5.6 the sharpness in the centre is still good. F/8 will result in peak quality, as it does throughout the zoom range and sharpness is good across the frame.

Resolution @ 100mm		Resolution @ 200mm
Resolution @ 300mm		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 a Panasonic Lumix G3 using Imatest.

For a super-telephoto zoom, levels of chromatic aberrations are remarkably low. At their worst they just exceed half a pixel width, which should not pose too many issues, even in large prints, or harsh crops from near the edges of the frame.

Chromatic aberration @ 100mm		Chromatic aberration @ 200mm
Chromatic aberration @ 300mm		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 a Panasonic Lumix G3 using Imatest.

As falloff and distortion are corrected by the camera's image processing engine when shooting JPEGs, falloff and distortion will only be easily visible when shooting in RAW format.

Falloff of illumination towards the corners is reasonably well controlled throughout the zoom range. At 100mm the corners are 1.2 stops darker than the image centre and at 300mm they are 1.58 stops darker. Visually uniform illumination is achieved one stop below maximum aperture throughout the zoom range.

Distortion is typical for a 3x telephoto zoom lens. At 100mm 1.58% barrel distortion is present and at 300mm 0.845% pincushion. These levels should pose few issues day to day, but if you do require absolutely straight lines, the distortion pattern is uniform across the frame, and should be relatively easy to correct in image editing software afterwards.

This lens is reasonably resistant to flare. Shooting into strong light sources will result in a noticeable loss of contrast, but images taken under these conditions are still very usable and easily corrected. Strong light sources just outside of the frame are dealt with well by the supplied lens hood.

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