Greetings,
Question, who makes binoculars with the most generous diopter adjustment? At least 5 diopters or possibly more, as I would like to use them without wearing glasses.
Leica Trinovid is an awesome unit but it only goes up to 4 diopters.
Leica or Swarovski would be my first choice, but do they make any models, especially in a 8x42 or 10x50?
My Zeiss 8x32 FL has ten gradations on the diopter setting. I presume that they are five diopters in half increments but I do not know for sure.
Happy bird watchinh,
Arthur Pinewood 
Looks like 4 diopters. No luck there either.
http://www.trifid-optics.com/b-binoculars-zeiss.htm