Just out of curiosity why? Eloquent converts it back to this at execution anyway. If you know the actual longhand query why use a shortcut query? Again not an answer, just curious.
Sorry couldn't edit:
A couple good examples are:
http://stackoverflow.com/questions/23328301/laravel-eloquent-left-join-where-null
http://stackoverflow.com/questions/17404743/laravel-4-query-builder-left-join-and-query
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