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General Photography
Aperture, FNumber, and Lightsource EXIF data
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<blockquote data-quote="Essence of Imagery" data-source="post: 3711" data-attributes="member: 920"><p><strong>Re: Hello!</strong></p><p></p><p></p><p></p><p>Max Aperture Value is referring to the largest f/stop (opening) that the particular lens has.</p><p></p><p>For instance:</p><p></p><p>18-70mm f/3.5-4.5G ED IF AF-S DX Nikkor Zoom Lens</p><p></p><p>18-70mm is the designation for the focal length (wide angle is 18, narrows down to 70mm).</p><p>f/3.5-4.5 is the aperture, f/3.5 being the larger opening, found on the "wide end" of the lens, compresses as the focal length increases. What makes the expensive, professional lenses as expensive as they are is that as the focal length increases, the aperture opening remains constant. It requires a lot more precision glass, a lot more engineering, and therefore they charge a LOT more for that glass.</p><p>The ED stands for Extra-Low Dispersion, the IF is Internal Focus (lens doesn't "grow" as you zoom in), the AF-S is "Auto-Focus Silentwave" which means the focusing motor is in the lens instead of relying on a body-mount focusing motor, and finally the DX stands for the size of the sensor that the lens was designed to use. FX is a full-frame (35mm) sensor, while the DX is an APS-C size sensor.</p><p></p><p>Back to the f/number - this relates to what the aperture opening was when the image was captured. In the instance you provide, someone wanted some extra depth of field, color absorption, or was dealing with too much light for the shutter speed or ISO, so they chose to "stop down" the lens to provide less light opening.</p><p></p><p>I learned that image capture can be adjusted like a triangle.</p><p></p><p>The three sides are:</p><p></p><p>ISO - how sensitive the "film" (or sensor) is to light</p><p>Aperture - how MUCH light the lens lets the "film" (or sensor) see.</p><p>Shutter speed - how LONG the "film" (or sensor) gets to "see" the light.</p><p></p><p><img src="http://www.essenceofimagery.com/nikonites/GG1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Here's the EXIF data:</p><p></p><p>Camera Make: Nikon Corporation</p><p>Camera Model: Nikon D300</p><p>Pixel Size: 4304 x 2852 (12.3MP)</p><p>Aperture: <em>f</em>/5.3</p><p>Shutter Speed: 8.0s (long-exposure for the colors and the light coming from the lower right corner of the image, which was the full moon over the city)</p><p>Exposure Bias: 0ev</p><p>Focal Length (35mm): 142.0mm (my camera is a DX, which has a smaller sensor than a 35mm or full-frame camera, therefore this is the comparable focal length)</p><p>Focal Length: 95mm (the actual focal length reading on the lens on the body of my camera)</p><p>ISO: ISO 200 (if I did this shot again, I'd shoot ISO 100, to make the exposure even longer, since the lower ISO is less sensitive to light)</p><p>Aspect Ratio: 3:2 (standard ratio on APS-C sensor cameras from Nikon)</p><p>Lens Minimum (mm): 18.0mm</p><p>Max. Lens Aperture: 4.8 (at the 95mm focal length, this is the maximum aperture <opening> that this lens will provide)</p><p>Lens Maximum (mm): 200mm</p><p>Lens: AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED</p><p>Color Model: RGB</p><p>Profile Name: Adobe RGB (1998)</p></blockquote><p></p>
[QUOTE="Essence of Imagery, post: 3711, member: 920"] [b]Re: Hello![/b] Max Aperture Value is referring to the largest f/stop (opening) that the particular lens has. For instance: 18-70mm f/3.5-4.5G ED IF AF-S DX Nikkor Zoom Lens 18-70mm is the designation for the focal length (wide angle is 18, narrows down to 70mm). f/3.5-4.5 is the aperture, f/3.5 being the larger opening, found on the "wide end" of the lens, compresses as the focal length increases. What makes the expensive, professional lenses as expensive as they are is that as the focal length increases, the aperture opening remains constant. It requires a lot more precision glass, a lot more engineering, and therefore they charge a LOT more for that glass. The ED stands for Extra-Low Dispersion, the IF is Internal Focus (lens doesn't "grow" as you zoom in), the AF-S is "Auto-Focus Silentwave" which means the focusing motor is in the lens instead of relying on a body-mount focusing motor, and finally the DX stands for the size of the sensor that the lens was designed to use. FX is a full-frame (35mm) sensor, while the DX is an APS-C size sensor. Back to the f/number - this relates to what the aperture opening was when the image was captured. In the instance you provide, someone wanted some extra depth of field, color absorption, or was dealing with too much light for the shutter speed or ISO, so they chose to "stop down" the lens to provide less light opening. I learned that image capture can be adjusted like a triangle. The three sides are: ISO - how sensitive the "film" (or sensor) is to light Aperture - how MUCH light the lens lets the "film" (or sensor) see. Shutter speed - how LONG the "film" (or sensor) gets to "see" the light. [img]http://www.essenceofimagery.com/nikonites/GG1.jpg[/img] Here's the EXIF data: Camera Make: Nikon Corporation Camera Model: Nikon D300 Pixel Size: 4304 x 2852 (12.3MP) Aperture: [I]f[/I]/5.3 Shutter Speed: 8.0s (long-exposure for the colors and the light coming from the lower right corner of the image, which was the full moon over the city) Exposure Bias: 0ev Focal Length (35mm): 142.0mm (my camera is a DX, which has a smaller sensor than a 35mm or full-frame camera, therefore this is the comparable focal length) Focal Length: 95mm (the actual focal length reading on the lens on the body of my camera) ISO: ISO 200 (if I did this shot again, I'd shoot ISO 100, to make the exposure even longer, since the lower ISO is less sensitive to light) Aspect Ratio: 3:2 (standard ratio on APS-C sensor cameras from Nikon) Lens Minimum (mm): 18.0mm Max. Lens Aperture: 4.8 (at the 95mm focal length, this is the maximum aperture <opening> that this lens will provide) Lens Maximum (mm): 200mm Lens: AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED Color Model: RGB Profile Name: Adobe RGB (1998) [/QUOTE]
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