I rarely use a blind with birds on the roost unless I have a lot of time to set up. I use a blind that you cannot see through. It has no green on one side and green on the other. Since we hunt the Ms. Delta, early in the season, birds can see 150 yards or more in some areas, so we tend to use blinds more early in the season . Later set ups, late morning or Pm, almost always require a blind until everything greens up. Since I use a box call almost exclusively, blinds are essential, whether they are log blinds or my moblile blind. I have killed a lot of birds out of log blinds that may take an hour or so to drag logs up and cross. Dr. Winn used to kill more birds with an old Stribling box and a log blind than any hunter I have ever known. It can be a deadly combination.