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"What You See Is What You Get" as applied to TTL (through the lens) Single Lens Reflex camera systems. In terms of viewfinders, it is applied to those with 100% frame coverage, as in the film pro series bodies: F, F2, F3, F4, F5 and F6.
Nikon DSLRs with 100% image coverage are most recently the D3 and D300.
