Kiss if the Vampire (1963) directed by Don Sharp

This was originally ment to go into the Hammer Dracula series but ended up it's own film instead. It is notable for swerving away from the typical vampire formula by having a coven of them led by a charismatic leader. There are with elements in the story as well.

A young couple gets caught up in a vampire cult when the leader of the cult takes a shine to the wife and arranges to befriend them as a ruse to kidnap her. at a masked ball he has one of group wear the same mask as her husband and lure her into a locked room. The guy is a good 5 inches taller than the husband but she fell for it anyway. There is a Van Helsing like character of sorts. A drunken man whose daughter has also fallen victim to the undead cult gets the husband t help him get both their family members free by calling 100s of vampire bats to attack the coven and kill them. This makes as much sense watching it as it did you reading it. 

The film looks good and while it's plot goes all over the place it's novel enough to keep your attention and only drags now and then. probably not something you would want to go back to over and over, though.