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<blockquote data-quote="Alx" data-source="post: 167999" data-attributes="member: 13868">'Good math.Some prefer a wider &quot;standard&quot; lens, like 40 or 35mm on the full-frame format.&nbsp; &quot;Standard&quot; has been technically defined by some tradition as the diagonal of the frame.&nbsp; 35mm film frame size being 24mm x 36mm, that gives a calculated diagonal of 43.27 mm, which is nearly midway between 50mm and 35mm.&nbsp; By that reasoning, the calculated standard focal length for the DX format (1.5 factor) is 28mm.&nbsp;&nbsp; The best Nikon AF 28mm is their AFS f1.8 prime lens, and it being a full-frame lens, when used on a DX format camera, gives the better center quality and crops out the corners and edges. The Nikkor 28mm f2.8 AiS manual lens might have even better image quality, giving up auto-focus, P and S modes, and 1.3 stops, but gaining durability and being lighter and smaller.If wanting the approximate view angle of a full-frame 35mm lens, as many of the most famous street photographers used, on DX you would need the 24mm lens.&nbsp; 'Best Nikon 24mm is their AFS 1.4 ... very pricy, but the lens forms the image, and will technologically outlast the DSLR you are using, by many years.&nbsp; The very respectable Nikkor 24mm f2.8, in AF-D or AiS are also available.</blockquote>

[QUOTE="Alx, post: 167999, member: 13868"] 'Good math. Some prefer a wider "standard" lens, like 40 or 35mm on the full-frame format. "Standard" has been technically defined by some tradition as the diagonal of the frame. 35mm film frame size being 24mm x 36mm, that gives a calculated diagonal of 43.27 mm, which is nearly midway between 50mm and 35mm. By that reasoning, the calculated standard focal length for the DX format (1.5 factor) is 28mm. The best Nikon AF 28mm is their AFS f1.8 prime lens, and it being a full-frame lens, when used on a DX format camera, gives the better center quality and crops out the corners and edges. The Nikkor 28mm f2.8 AiS manual lens might have even better image quality, giving up auto-focus, P and S modes, and 1.3 stops, but gaining durability and being lighter and smaller. If wanting the approximate view angle of a full-frame 35mm lens, as many of the most famous street photographers used, on DX you would need the 24mm lens. 'Best Nikon 24mm is their AFS 1.4 ... very pricy, but the lens forms the image, and will technologically outlast the DSLR you are using, by many years. The very respectable Nikkor 24mm f2.8, in AF-D or AiS are also available. [/QUOTE]

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