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35mm 1.8 DX or 50mm 1.8 FX
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<blockquote data-quote="alfaholic" data-source="post: 129618" data-attributes="member: 13066"><p>First of all, 50mm f1.8 <strong>G</strong> is DX lens, not FX. The old one, 50mm f1.8 <strong>D</strong> is made for film and FX.</p><p>Second, either you use FX or DX lens with your D5100 you will get the same FOV, just with FX lens you will be using only cropped center of the glass, so in theory you will have better quality, but in practice it may be different story.</p><p>Third, your D5100 will not auto focus with 50mm f1.8 <strong>D</strong> lens, so if you want 50mm lens you should go for DX 50mm f1.8 <strong>G</strong>, unless you want to focus manually.</p><p>And fourth, no matter your lens is designated as DX or FX, on a cropped sensor camera you have 1.5x magnification/crop factor, so if you use 35mm lens it will be almost the same as 50mm on full frame camera, 50mm on DX will be 75mm on DX, and so on.</p><p></p><p>It depends of your needs, but on a DX camera 35mm lens is far more usable than 50mm, my advice is to begin with 35mm, and then later add 50mm to your lens collection.</p><p>As for FX and DX, I would still buy a DX 50mm f1.8 G, because it is better wide open than the old one, but more expensive and with little bit more distortion.</p></blockquote><p></p>
[QUOTE="alfaholic, post: 129618, member: 13066"] First of all, 50mm f1.8 [B]G[/B] is DX lens, not FX. The old one, 50mm f1.8 [B]D[/B] is made for film and FX. Second, either you use FX or DX lens with your D5100 you will get the same FOV, just with FX lens you will be using only cropped center of the glass, so in theory you will have better quality, but in practice it may be different story. Third, your D5100 will not auto focus with 50mm f1.8 [B]D[/B] lens, so if you want 50mm lens you should go for DX 50mm f1.8 [B]G[/B], unless you want to focus manually. And fourth, no matter your lens is designated as DX or FX, on a cropped sensor camera you have 1.5x magnification/crop factor, so if you use 35mm lens it will be almost the same as 50mm on full frame camera, 50mm on DX will be 75mm on DX, and so on. It depends of your needs, but on a DX camera 35mm lens is far more usable than 50mm, my advice is to begin with 35mm, and then later add 50mm to your lens collection. As for FX and DX, I would still buy a DX 50mm f1.8 G, because it is better wide open than the old one, but more expensive and with little bit more distortion. [/QUOTE]
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Lenses
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35mm 1.8 DX or 50mm 1.8 FX
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