Бас нэг хэрэгтэй мэдээлэл. Дурангын Sharpness шалгах. How to test your lens’ sharpness The best way to test your lens sharpness is to use a test card, like the one we’ve used here. To get ready to test your lens, you need to ensure that your camera back is parallel with the chart, and the middle of the lens is aligned with the chart’s centre point. The chart also needs to be evenly lit. The ideal solution is to position two lights either side of the chart, but soft, diffused window light will do the job. Set your camera to shoot raw files and use the lowest ISO setting for the best quality results. Shoot your chart at each aperture setting, then open the images to compare the results. The most obvious differences between the results at different apertures will be at the edges, so zoom in to 100% and look closely at the detail resolution in this area. By checking each image you can determine your lens’s best aperture for the sharpest results. You can also check the amount of fringing (purple/yellow or red/cyan) visible at the edges of the star, and distortion (bending of the lines on the edge of the chart). Both of these can be corrected using the Lens Correction options in Photoshop CS2 or later. Here’s how to test your lens’ sharpness step-by-step. https://dropbox/s/947lcapkrae1x9d/testcardCanon5Dmk3.JPG?dl=0
Posted on: Mon, 20 Oct 2014 08:38:49 +0000
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