Forum: Pentax SLR Lens Discussion
07-12-2013, 02:39 PM
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If you are using Lightroom or Photoshop, you can download the Adobe Lens Profile Creator (it is free) and it has several targets with checker patterns you can print in many sizes.
Not only you can check for distortion, but you can actually create a profile for the lens that Lightroom and PS can use to correct you images for distortion and vignetting.
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