Sony’s full-frame mirrorless camera lineup includes a variety of models aimed at the unique needs of different users. The Sony a7R series provides the highest resolution, the Sony a7S series has the highest sensitivity and pixel-for-pixel 4K video, and the Sony a9 offered the fastest autofocus and continuous frames-per-second shooting when it was introduced. For my work, that meant I typically traveled with a7R series cameras for portraits and landscapes and an a9 for action. Switching between them was a reminder of the tradeoff between resolution and speed. Because of this, none of these cameras was a true “flagship” camera. [See image gallery at www.outdoorphotographer.com] That’s the beauty of Sony Alpha 1. Its 50-megapixel sensor nearly matches a7R IV’s 61-megapixel resolution...