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Tamron full frame lense on Nikon AP-C ?
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<blockquote data-quote="Danno" data-source="post: 713937" data-attributes="member: 34269"><p>I have seen this explained in a video by Tony Northrop, but it is not accurate. His results are anecdotal at best. Aperture is a physical characteristic of the lens. When I saw this video I became very puzzled because it made no sense to me. So I simply sought out the math. </p><p></p><p>Crop factor affects the field of view of a lens because the sensor is smaller, but it does not affect the aperture because it does not impact the field of view or depend on the size of the sensor. It is like the pupil of an eye it opens or closes to simply control light. The f-stop is a mechanical characteristic of the lens. The f-stop is the actual the focal length divided by the f-stop value. It gives you the Diameter of the opening. To get the area of the opening you just do the simple divide the diameter by 2 for the radius and plug the value in the formula for area, <img src="https://www.mathgoodies.com/sites/default/files/lesson_images/area_formula.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />. </p><p></p></blockquote><p></p>
[QUOTE="Danno, post: 713937, member: 34269"] I have seen this explained in a video by Tony Northrop, but it is not accurate. His results are anecdotal at best. Aperture is a physical characteristic of the lens. When I saw this video I became very puzzled because it made no sense to me. So I simply sought out the math. Crop factor affects the field of view of a lens because the sensor is smaller, but it does not affect the aperture because it does not impact the field of view or depend on the size of the sensor. It is like the pupil of an eye it opens or closes to simply control light. The f-stop is a mechanical characteristic of the lens. The f-stop is the actual the focal length divided by the f-stop value. It gives you the Diameter of the opening. To get the area of the opening you just do the simple divide the diameter by 2 for the radius and plug the value in the formula for area, [IMG]https://www.mathgoodies.com/sites/default/files/lesson_images/area_formula.gif[/IMG]. [SIZE=3][FONT=Calibri][/FONT][/SIZE] [/QUOTE]
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Tamron full frame lense on Nikon AP-C ?
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