All the Dots are Brown: Ambiguity in Kropki = Fabulous Sudoku

Today's Puzzle:

An incredible construction from gdc with a logical step all the time to uncover this fog.

Link to Play Along:

All the Dots are Brown by gdc http://tinyurl.com/SudokuSleuthAllDotsAreBrown

Rules:

...and the Fog is Grey...

Normal Sudoku rules apply.

The grid is covered in fog. Placing correct digits reveals clues in the surrounding 3x3 area.

Digits separated by a brown dot are either consecutive or in a 1:2 ratio. Not all dots are necessarily given.