If manufacturing, design and economic constraints were nissues, the perfect lens would cover a huge range of focal lengths, from wide angle to long telephoto and a very wide, constant maximum aperture would be always available. That lens would focus fast and consistently accurately, would feature top notch weather-sealed build quality, would deliver amazing image quality, would have a lightweight, compact design and would carry a very reasonable price tag. As you might have guessed, the perfect lens still does not exist. However, this lens checks off many items in the "perfect lens" wish list, including an extremely-useful, DSLR-record-setting, 22.2x long focal length range, a very compact and lightweight design and the reasonable price tag is there.
Tamron LENS 18-400mm f3.5 - 6.3 Di II VC HLD used
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