The results show unequivocally that the 18-35 is an exceptionally weak performer on full frame, definitely the poorest performance I’ve yet observed from any lens in its range.
You get what you pay for. Well, actually you don’t. This lens is not a good value. At about $599, the 18-35 is grossly overpriced for what it delivers. It should be rebadged as a $189 kit lens and designated as a DX lens. It is simply unsuitable for full-frame cameras.
The following are key points working against the 18-35mm f/3.5 - f/4.5:
- Dull, low contrast images anywhere outside the central 2/3 area.
- Strong blur with low contrast at edges and corners.
- Compared to the 16-35, a focal length at the long end equivalent to 33.7mm.
- Very strong distortion at the wide end.
- Very slow aperture at 35mm setting. And the very low quality at edges and corners really makes this an f/8 - f/11 lens for acceptable images.
- Plastic build quality including a ridiculous front-end and obnoxiously large lens hood compared to the size of the lens itself.
- Longevity of its mechanical operation seems dubious at best, and the design looks to be one that will readily admit dust and moisture.
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