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• n  the distance from a lens to its focus

• focal distance

News & Articles

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• Pentax SMC DA Star 50-135mm F2.8 ED (IF) SDM
  The Pentax SMC DA Star 50-135mm F2.8 ED (IF) SDM is a pro-level zoom lens with weather sealing and a wide aperture, but it is a bit soft at its longest focal length and on the pricey side.
  June 11, 2013 - PC Magazine