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DxOmark site ratings of 70-200 2.8 lenses
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<blockquote data-quote="BackdoorArts" data-source="post: 371525" data-attributes="member: 9240"><p>If you're going to look at DxOMark scores you <em>must</em> compare against the same sensor (I recommend the D800 given your camera) and you <em>must</em> drill down into the measurements to see where the differences really are and determine how applicable to your shooting they might be. Truth is, the Nikon and Tamron are pretty close across the board, with much of the Tamron's differences owing a lot to going to f32 as a minimum aperture.</p><p></p><p>One thing DxO does <em>not</em> measure is the effective focal length and focus breathing. Zooms will invariably focus breath, meaning that the effective focal length at minimum focus distance may actually be quite a bit less than at infinity. Why is this important? Because if you're using it as a portrait lens and shooting at the near end of your focus range, your 200mm may be closer to 135-150mm and you'll get the object compression associated with that length and not 200mm. Additionally, 200mm isn't always 200mm even at infinity. My understanding (and these numbers are harder to come by) is that while the Tamron breathes less, at 200mm it is actually much closer to 175mm than 200mm even at infinity. </p><p></p><p>My point? Never look just at the numbers. Get to a shop or a show and test them both out, and look for things like focus breathing. Bring your camera and take side by side shots at various, similar focus lengths and apertures and then compare the two. Maybe even rent them for a weekend and really give them a go.</p><p></p><p>And for sure resale is going to be a big consideration, and while Tamron may be everything the Nikon is and more, if you go to move it you're likely going to see less of a return on that investment.</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 371525, member: 9240"] If you're going to look at DxOMark scores you [I]must[/I] compare against the same sensor (I recommend the D800 given your camera) and you [I]must[/I] drill down into the measurements to see where the differences really are and determine how applicable to your shooting they might be. Truth is, the Nikon and Tamron are pretty close across the board, with much of the Tamron's differences owing a lot to going to f32 as a minimum aperture. One thing DxO does [I]not[/I] measure is the effective focal length and focus breathing. Zooms will invariably focus breath, meaning that the effective focal length at minimum focus distance may actually be quite a bit less than at infinity. Why is this important? Because if you're using it as a portrait lens and shooting at the near end of your focus range, your 200mm may be closer to 135-150mm and you'll get the object compression associated with that length and not 200mm. Additionally, 200mm isn't always 200mm even at infinity. My understanding (and these numbers are harder to come by) is that while the Tamron breathes less, at 200mm it is actually much closer to 175mm than 200mm even at infinity. My point? Never look just at the numbers. Get to a shop or a show and test them both out, and look for things like focus breathing. Bring your camera and take side by side shots at various, similar focus lengths and apertures and then compare the two. Maybe even rent them for a weekend and really give them a go. And for sure resale is going to be a big consideration, and while Tamron may be everything the Nikon is and more, if you go to move it you're likely going to see less of a return on that investment. [/QUOTE]
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