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 | EF: SY14/2.8, V20/3.5, 24/2.8, 35/2, Ʃ35/1.4, 50/1.8, Ʃ50/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L, T28-300 Di VC PZD | E: SY12/2, 35/1.8 OSS, 16-70 ZA OSS, 55-210 OSS, SY300/6.3 ED UMC CS, Metabones SB | Vintage FD & FL glass.