Here's a good piece on what changed: http://www.bhphotovideo.com/explora/photography/features/who-killed-infinity-focus%3F http://www.bhphotovideo.com/explora/

Here's a good piece on what changed: http://www.bhphotovideo.com/explora/photography/features/who-killed-infinity-focus%3F http://www.bhphotovideo.com/explora/photography/features/who... Different manufactures gave different reasons, but in general you should always go by sight and not a ∞ mark. Even in a manual Nikkor lens there will be a shift based on temperature so you don't want to strictly go by the numbers (which is why ∞ is often juuust past focus, it lets you work in more environments).