The Problem With Nikon DX Lenses
If you are upgrading from a Nikon DSLR with a smaller DX sensor, you will probably have some wide-angle DX lenses, like the Nikkor AF-S 12-24mm f/4 DX, the Nikkor AF-S 17-55mm f/2.8 DX or third-party lenses from Tamron, Tokina and Sigma. Some of them are fantastic DX lenses that works extremely well with all Nikon DSLRs, except the newest D3x, D700 and D3 camera bodies.
If you have a collection of these lenses, yes, they will still work fine on full-frame cameras like the Nikon D700. However, you will need to use DX crop mode, or simply zoom pass the point at which vignetting occurs. For example, zooming a lens like the Nikkor 12-24mm f/4 to 18 mm or beyond. To the uninitiated, vignetting refers to the circular blocking of the edges of the picture, caused in this case by the design of the DX lenses which are designed to focus on the smaller DX sensor.
When the Nikon D700 is set to the DX crop mode, it will only use the central part of the sensor (about 5.1 million pixels in total), instead of the full sensor area which has 12.1 million pixels. That may be fewer pixels than even the prosumer-level Nikon D70, but it sure is an upgrade from the Nikon D2H professional DSLR which only has a 4.1 megapixel sensor. Of course, any serious photographer can tell you that megapixels do not tell the whole story. Noise and sensor sensitivity are equally, if not more important.
However, using DX crop mode is really difficult using Nikon's default settings. Many D700 photographers end up using it the wrong way. This is what Chai will be covering in this guide - how to effectively used the DX crop mode in the Nikon D700.
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