Reviews and Problems with Pentax smc DA 18-250mm f/3.5-6.3
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Pentax SMC DA 18-250mm f/3.5-6.3 Lens Review
28 October 2010
Summary: As I mentioned earlier, lenses with huge zoom ranges like this often result in compromise of some sort. It seems unfortunate in this case that the aspect of performance to lose out is sharpness at maximum aperture, which is how I believe a lens like this will be used most of the time.
Pros: Low distortion for a superzoom, Low CA levels, Impressive zoom range
Cons: Disappointing resolution at maximum aperture, Slow AF, Susceptible to flare