Just to share this information with all macusers: F13
worked before Incarna release, and is working even after it (I wasn't sure of it, now I tested).
The most notable change since Incarna is the path
where to find the screenshot: before was /Users/<username>/Library/Preferences/EVE Online Preferences/p_drive/My Documents/EVE/capture/Screenshots/ and now it's changed to /Users/<username>/Library/Application Support/EVE Online/p_drive/My Documents/EVE/capture/Screenshots/
where screenshots file are saved in JPG format.EVElopedia
reported the use of cmd+shift+3, which have big drawbacks (even if OSX standard, as it uses Grab):
1) it saves the file directly to Desktop
2) the file format is PNG, not JPG, so any shot weighs 2-2,5 MB instead of 2-300 KB
Now EVElopedia is updated also (hope it helps and not did bad things ;))
This thread/post is just for general information and (mostly) to help who, like me, searched the net, EVElopedia and forum for a while, before casually stumble on the new path. Hope it helps too.