Sensor and Image Quality
Full-Frame Sensor: The 5D Mark II features a 21.1-megapixel full-frame CMOS sensor, providing exceptional image quality, depth of field, and low-light performance.
ISO Range: The camera offers a native ISO range of 100-6400, expandable up to 25,600, allowing for flexibility in various lighting conditions.
Image Processor: It uses the DIGIC 4 processor, which ensures fast image processing and effective noise reduction.

Autofocus and Shooting
Autofocus System: The camera is equipped with a 9-point autofocus system with 6 assist points for enhanced accuracy. It also features advanced focusing options to suit different shooting scenarios.
Continuous Shooting: The 5D Mark II can shoot at up to 3.9 frames per second, providing decent burst capability for general photography.

Video Capabilities
HD Video: The 5D Mark II was one of the first DSLRs to offer Full HD 1080p video recording at 30 frames per second. It became a popular choice for videographers and filmmakers due to its high-quality video output.
Audio Options: The camera has a 3.5mm microphone input for external audio recording, allowing for improved sound quality during video production.

Design and Ergonomics
Build Quality: The body is constructed from magnesium alloy, offering durability and robustness, suitable for professional use.
LCD Screen: It has a 3-inch LCD screen with approximately 920,000 dots, providing clear and sharp image previews and Live View functionality.
Viewfinder: The optical pentaprism viewfinder offers about 98% frame coverage, allowing precise composition of shots.

Lens Compatibility
EF Lens Mount: The 5D Mark II uses the Canon EF lens mount, making it compatible with a wide range of Canon EF lenses. This flexibility is ideal for photographers with existing Canon equipment or those looking to expand their lens collection.

Other Features
Battery and Storage: The camera uses the LP-E6 rechargeable battery, providing solid battery life. It supports CompactFlash (CF) cards for storage, which are durable and reliable.
Customizable Controls: The camera offers customizable settings, allowing users to tailor the experience to their preferences and shooting style.