The first ever production FF DSLR was the Contax N of spring 2002. The 1Ds was the second FF DSLR, launched in September 2002, allowing of EF lenses with the conventional film AoV.
Worth noting that the Contax N used a
Phillips CCD sensor, and the 1Ds was CMOS. Similarly, the original 1D was a CCD sensor (with a 1/500 s Xsync, and made by Panasonic), while the 1D II and subsequent models were CMOS.
5D3, 5D2, Sony α6000, G16 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 2.0x III, 70-300L | E-mount: SY12 f/2, 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses