深度审查（推荐）：在 Ling Studio 里交给 Ring-2.5-1T 做 Code Review，强项是推理严谨与长程上下文。
Diagrams from redesign 3, hand-written SVG
。WPS下载最新地址对此有专业解读
If you’re into wide-format instant cameras but don’t want to spend $409.95 — or prefer a more traditional analog experience — the $175.95 Instax Wide 400 is a solid pick. The basic point-and-shoot produces similar stills to the Wide Evo, and in some ways, it’s easier to use, thanks to its stripped-down feature set. That simplicity, however, comes at the cost of customization, making it harder to capture the perfect shot. It also swaps an LCD display for a large viewfinder and is noticeably heavier than the Instax Mini Evo. Nonetheless, if you’re after wide prints at a more affordable price, it’s a worthwhile option.
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好