We have measured the distribution of intrinsic ellipticities for a sample of 28 relatively face–on spiral disks .
We combine H \alpha velocity fields and R and I -band images to determine differences between kinematic and photometric inclination and position angles , from which we estimate intrinsic ellipticities of galaxy disks .
Our findings suggest disks have a log-normal distribution of ellipticities ( \overline { \epsilon } = 0.06 ) and span a range from \epsilon = 0 ( circular ) to \epsilon = 0.2 .
We are also able to construct a tight Tully-Fisher relation for our face-on sample .
We use this to assess the contribution of disk ellipticity on the observed Tully-Fisher scatter .