The SDSS Coadd: Cosmic Shear Measurement
  Stripe 82 in the Sloan Digital Sky Survey was observed multiple times,
allowing deeper images to be constructed by coadding the data. Here we analyze
the ellipticities of background galaxies in this 275 square degree region,
searching for evidence of distortions due to cosmic shear. The E-mode is
detected in both real and Fourier space with $>5$-$\sigma$ significance on
degree scales, while the B-mode is consistent with zero as expected. The
amplitude of the signal constrains the combination of the matter density
$\Omega_m$ and fluctuation amplitude $\sigma_8$ to be $\Omega_m^{0.7}\sigma_8 =
0.252^{+0.032}_{-0.052}$.
