^ This. Also, honestly im stuck in the exact same boat as Milan right now and it is beyond frustrating. Trying to settle on a rig for my own archival project for months has been a nightmare and neither choice between the Sony A7 IV and the Sony A7CR feels right for professional reliability. Unfortunately, previous issues with smaller bodies overheating during long tethered sessions make me really nervous about the Sony A7CR for this. This dilemma has been haunting me for over half a year now. Still cant find a definitive answer on which one is gonna actually survive a high-volume scanning environment without a hitch. Just really disappointing that there isnt more data out there for those of us doing this specific kind of work... just feel totally stuck.

Thank you for providing such detailed information about your specific needs. Both the Sony A7 IV and Sony A7CR are excellent cameras, but for your particular use case in the Historical Archives, I would recommend the Sony A7CR. Here's why:

1. Image Quality: The Sony A7CR features a 61MP full-frame sensor, compared to the 33MP sensor in the A7 IV. This higher resolution is crucial for capturing fine details in old documents, maps, and books, especially when dealing with faded text or intricate designs.

2. Dynamic Range: The A7CR offers a wider dynamic range, which is beneficial when dealing with aged, faded documents. This will help in recovering details from both highlights and shadows.

3. Pixel Shift Multi-Shooting: The A7CR has a Pixel Shift Multi-Shooting mode, which can create ultra-high resolution images (up to 240MP). This feature is particularly useful for capturing the finest details in large format documents (like your A0 size materials).

4. No Anti-Aliasing Filter: The A7CR lacks an optical low-pass filter, which results in sharper images. This is ideal for document reproduction where maximum detail is crucial.

5. Reduced Vibration: The A7CR has a more advanced in-body image stabilization system, which is beneficial when shooting at slower shutter speeds, often necessary in archive environments with controlled lighting.

6. Tethering Capabilities: Both cameras offer tethering, but the A7CR's higher resolution will be more beneficial when previewing images on a computer screen in real-time.

7. Durability and Support: Both cameras are well-built and have good support networks. Sony's professional support is generally excellent, so you should be well-covered in case of any issues.

8. Lens Compatibility: Both cameras use the same E-mount system, so you have a wide range of high-quality lenses available. For your work, consider pairing the camera with a high-quality macro lens for close-up work on smaller documents.

While the A7 IV is a fantastic camera, the A7CR's higher resolution and specialized features make it more suitable for archival work, especially when dealing with large format documents and faded materials. The extra detail captured will be invaluable for preservation and study purposes.

Remember to also invest in proper lighting equipment to ensure even illumination of your documents, which will help in capturing the best possible images.

A7CR is recommended.