Until now, I have decided to use the Leica 3a, which was released in 1935, for architectural photography.
This is because the Leica is a camera suitable for architectural photography (see " leica IIIa/Leica 3a "), and at the same time there was no digital camera suitable for architectural photography.

However, a digital camera suitable for architectural photography has finally been released.
LUMIX G1 released by Panasonic.
In the past, I wrote an article about the company's TZ series (LUMIX DMC-TZ series). He commented that it was a legacy of the past and unsuitable for lenses. As for the direction of future evolution, I wrote that we will improve image quality, wide angle, and compactness by increasing the degree of freedom in lens design by compensating for chromatic and distortion aberrations and the reduction in peripheral illumination with image processing.
Then came the LUMIX G1. Its features are summarized below.
1. Because there are no mirrors, the lens design is highly flexible, compact, and there is no mirror shock. 2. Each aberration is compensated for by image processing, and overall excellent image quality can be obtained by combining lens performance and digital processing. 3. Interchangeable lenses. Real-time distortion correction is performed, and there is no distortion from the live view screen

This fits perfectly with what I foresaw. The actual image is also good, especially the LUMIX G VARIO 7-14mm, which is an ultra-wide-angle zoom lens with a 35mm equivalent of 14mm, has no distortion and excellent resolution. On top of that, it's extremely compact and has excellent performance.
If you need a movie function, there is also the option of GH1. It's surprising that you can buy equipment that can shoot ultra-wide-angle movies without distortion at such a price.