Quote Originally Posted by AgX View Post
What is the idea behind a long(-er) front thread?
Only that that is a marker for the age of the filter. These are less expensive and less desirable to the new marketing. They are more likely to vignette if stacked but a polarizer is held more firmly to another filter with more turns to the screw.
And besides they are heavier and more solid, which appeals to my luddite aesthetic.