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<blockquote data-quote="Andy Smith" data-source="post: 1621" data-attributes="member: 20"><p>Usually with any new lens I will take a series of about 10 images of the same subject, with each image using a different f/ number. Starting at the extremes and stopping up/down until I cover a good range of the lens capabilities. </p><p>For zoom lenses I would do the same, but with additional photos at different zoom lengths.</p><p>I then have a series of images I can compare to see at what settings the lens get softer, and if it is actually noticeable. </p><p>I then know where the best range is for the lens.</p><p></p><p>I have never checked any of my lenses to see if they are decentered, but you could do a similar series of test shots of a distant object.</p><p>use a tripod, use manual focus and set it on a prominent point that sticks out.</p><p>use the widest aperture you can and then take a shot with the prominent object centred. </p><p>Move the camera until that object is in the upper left corner (do not change focus) and take another shot.</p><p>Repeat this step moving the object to the other 3 corners for each shot.</p><p></p><p>You can then compare the shots of the corners and see if any are sharper or have less detail than the others.</p></blockquote><p></p>
[QUOTE="Andy Smith, post: 1621, member: 20"] Usually with any new lens I will take a series of about 10 images of the same subject, with each image using a different f/ number. Starting at the extremes and stopping up/down until I cover a good range of the lens capabilities. For zoom lenses I would do the same, but with additional photos at different zoom lengths. I then have a series of images I can compare to see at what settings the lens get softer, and if it is actually noticeable. I then know where the best range is for the lens. I have never checked any of my lenses to see if they are decentered, but you could do a similar series of test shots of a distant object. use a tripod, use manual focus and set it on a prominent point that sticks out. use the widest aperture you can and then take a shot with the prominent object centred. Move the camera until that object is in the upper left corner (do not change focus) and take another shot. Repeat this step moving the object to the other 3 corners for each shot. You can then compare the shots of the corners and see if any are sharper or have less detail than the others. [/QUOTE]
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