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11-16mm Tokina Distortion Shots
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<blockquote data-quote="Joseph Bautsch" data-source="post: 19091" data-attributes="member: 654"><p>Sorry I should have included the EXIF data. The f/stop I used was f/18. The ISO 200, Focal length DX 11mm, FX 16.5mm, Focus Distance 1.6 feet. The camera was tripod mounted and a level was used on both the vertical and the horizontal axis. I used f/18 because most lenses are engineered to perform at their best in the f/11 to f/18 range. That is because it is the most commonly used shooting range. Shooting at higher f/stops may increase the DOF but does not have a significant affect on the sharpness. The lenses sharpness is a characteristic of the glass not of the f/stop. In some of the lesser quality lenses at higher f/stops the light starts to refract around the edges of the iris blades and actually begins to soften the shot. At these settings the depth of field was .66 feet near limit and infinity at the far limit. So the shot was taken well within the DOF. I used a brick wall because it has horizontal lines that will show any barrel distortion and has a lot of texture and shape to make the sharpness of the lens more visible. It should also be noted that this is only a display of the sharpness fall off from the center of the lens to the outside edge. At 107.4 times enlargement pixel grain in the D90 sensor and processor becomes more significant than any loss of lens sharpness. A camera body with a higher ISO resolution would provide a better display of actual sharpness.</p></blockquote><p></p>
[QUOTE="Joseph Bautsch, post: 19091, member: 654"] Sorry I should have included the EXIF data. The f/stop I used was f/18. The ISO 200, Focal length DX 11mm, FX 16.5mm, Focus Distance 1.6 feet. The camera was tripod mounted and a level was used on both the vertical and the horizontal axis. I used f/18 because most lenses are engineered to perform at their best in the f/11 to f/18 range. That is because it is the most commonly used shooting range. Shooting at higher f/stops may increase the DOF but does not have a significant affect on the sharpness. The lenses sharpness is a characteristic of the glass not of the f/stop. In some of the lesser quality lenses at higher f/stops the light starts to refract around the edges of the iris blades and actually begins to soften the shot. At these settings the depth of field was .66 feet near limit and infinity at the far limit. So the shot was taken well within the DOF. I used a brick wall because it has horizontal lines that will show any barrel distortion and has a lot of texture and shape to make the sharpness of the lens more visible. It should also be noted that this is only a display of the sharpness fall off from the center of the lens to the outside edge. At 107.4 times enlargement pixel grain in the D90 sensor and processor becomes more significant than any loss of lens sharpness. A camera body with a higher ISO resolution would provide a better display of actual sharpness. [/QUOTE]
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11-16mm Tokina Distortion Shots
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