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Old Sep 9, 2005, 10:55 AM   #1
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If any of Nikon's current lenses work fine with Nikon's current dSLRs, why bother having a special product line of dSLR lenses?

For instance, what does the 55-200mm f/4-5.6G ED AF-S DX Zoom-Nikkor do for a D70s that the 28-200mm f/3.5-5.6G ED-IF AF Zoom-Nikkor doesn't do?

Why would someone buy a DX Nikkor instead of a regular Nikkor? Are the DX Nikkors lighter? less expensive? lower quality? Do they match the color scheme used on the dSLRs?
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Old Sep 9, 2005, 12:06 PM   #2
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Current Nikon DSLR models have a sensor that is smaller than 35mm film. As a result the image circle needed doesn't have to be as large.

DX lenses are designed with a smaller sensor in mind, so that size and weight are reduced compared to the same lens for a 35mm camera.

On the downside, because of the smaller image circle, these lenses can't be used on a 35mm camera, and you won't be able to use them on a "full frame" (same sensor size as 35mm film) DSLR model, should Nikon decide to release one in the future.

With the two lenses mentioned above, one will work on 35mm and DSLR models, and the DX lens will not (it's designed to work with DSLR models only). One has AF-S (Silent Wave Motor), which means the lens is builtfor faster and quieter focusing via a built it's Silent Wave Motor. One lens has a wider focal range compared to the other (which means it's likely going to compromise optical quality more compared to the lens without this much focal range).

You really need to take each lens on a case by case basis, as any manufacturer has lenses with a wide variety of quality.

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Old Sep 12, 2005, 10:59 AM   #3
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The DX lenses are newer designs, and therefor have optical formula improvements. Case in point, the 17-55 f/2.8G AF-S. It's supposed to replace the 17-35 f/2.8D AF-S with a bit more zoom range, sharper images throughout the zoom range as compared to the 17-35, similar quality build, better chromatic aberration control because the 17-55 is purpose built around the smaller image circle. But nothing is without its faults. Because the 17-55 has more elements it will flare more than the 17-35 (14 vs 13) against backlit subjects. But the positives far outweight the only negative I see here. Another example would be the 10.5 f/2.8G DX fisheye. It's a bit longer (2.5" vs 2.3") and ever so slightly heavier than the 16 f/2.8D fisheye, but that's due to two extra elements, including an ED element for better chromatic aberration control throughout the entire frame. And it can also focus much closer than the 16 fisheye made for fullframe. I was once a skeptical of DX, but now am a convert┬*[img]/forums/images/emoticons/cool.gif[/img]┬*I can't wait to see a replacement of the 28-70 f/2.8D AF-S in DX format... I've heard rumors of a DX version that will have a constant f/2 aperture!┬*[img]/forums/images/emoticons/sprachlos020.gif[/img]┬*Now wouldn't that be worth a try?
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