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DT lenses can only be used with certain restrictions on full-frame digital cameras . These types of lenses are specifically designed for use with digital cameras that have an APS-C size image sensor and are smaller than the image sensors in full-frame digital cameras.
When a DT lens is attached to a full-frame digital camera, the entire surface of the image sensor cannot be used.
The camera will only use part of the image sensor that is equivalent in size to an APS-C sensor. The image size is automatically set to that of the APS-C size setting. Also, although it will not show up in the recorded images, vignetting will be seen in the viewfinder of the DSLR-A900 and DSLR-A850 cameras when shooting wide-angle pictures. In addition, exposure accuracy is not guaranteed with DT lenses in certain shooting situations when using the DSLR-A900 and DSLR-A850 cameras.
NOTE: This is an example of vignetting as seen in an optical viewfinder.