The EOS-1Ds body is based around the EOS-1V professional film SLR. From a size point of view the 1Ds body is almost identical to an EOS-1V with the additional powerdrive booster attached. The base of the camera contains the large battery pack and allows for the integration of a vertical (portrait) hand grip and control system. Build quality is superb, the entire body moulded from magnesium alloy with environmental seals around every compartment door, terminal, connector and button. Canon EOS-1Ds major features summary Professional EOS Digital SLR Magnesium body, environmentally sealed, based on EOS-1V Integrated battery compartment / vertical hand grip 11.4 megapixel CMOS sensor (primary colour filter) Full frame sensor, no field of view crop / focal length multiplier Output image size: 4064 x 2704 or 2032 x 1352 JPEG (Fine/Normal), RAW (12-bit) Simultaneous RAW+JPEG mode (saves RAW plus either Full size or Half size JPEG) Maximum burst speed of 3 fps for up to 10 JPEG frames or 10 RAW frames Option to also record a JPEG file when shooting RAW ISO 100 - 1250 in 1/3 stop steps, ISO 50 available from a custom function ISO sensitivity bracketing Same 45-point AF as EOS-1V Response time similar to the EOS-1V - 57 ms shutter release and 87 ms viewfinder blackout Evaluative, Partial, Center-weighted, Spot and Multi-spot metering Shutter speed range: Bulb, 30 - 1/8,000 sec (1/250 sec flash X-sync) Aperture range: F91 - F1 Noise reduction can be enabled for exposures 1/15 sec or slower IEEE 1394 (Firewire) connectivity CF Type I or II (inc. IBM Microdrive) Hybrid Auto White balance combines external white balance sensor and main sensor White balance bracketing Up to three parameter sets: tone (gamma) curve, sharpening, JPEG compression ratio Selectable 'colour matrix' settings define colour space (sRGB / Adobe RGB) and balance 21 custom functions, 26 personal functions, which can be stored into 'function groups' Bracketing of exposure (shutter / aperture), white balance and ISO sensitivity Voice annotation capability (built-in microphone) Illuminated status LCD's Supplied RAW conversion application (File Viewer Utility) Supplied remote capture (tethered operation) software Double battery charger New features / updates since the EOS-1D Full-frame 11 megapixel CMOS sensor Continuous shooting down to 3 fps, max 10 images ISO range 100 - 1250, ISO 50 selectable from custom function Noise reduction takes effect from 1 sec (1/15 sec for the EOS-1D) Personal functions can be set via in-camera menu JPEG compression now represented as numbers rather than a ruler FAT32 filesystem support for Compact Flash cards greater than 2 GB Playback magnification now available Images can be tagged with a unique 'signature' for use with Data Verification Kit Improved battery life (thanks to CMOS sensor) Fastest shutter speed down to 1/8,000 sec (1/16,000 sec for the EOS-1D) X-Sync speed down to 1/250 sec (1/500 sec for the EOS-1D) Eleven megapixels 2424 Shutter Actuations as measured by ShutterCounter.com