  We present a lensing study of 42 galaxy clusters imaged in Sloan Digital Sky
Survey (SDSS) commissioning data. Cluster candidates are selected optically
from SDSS imaging data and confirmed for this study by matching to X-ray
sources found independently in the ROSAT all sky survey (RASS). Five color SDSS
photometry is used to make accurate photometric redshift estimates that are
used to rescale and combine the lensing measurements. The mean shear from these
clusters is detected to 2 h-1 Mpc at the 7-sigma level, corresponding to a mass
within that radius of 4.2 +/- 0.6 x 10^14 h-1 M_sun. The shear profile is well
fit by a power law with index -0.9 +/- 0.3, consistent with that of an
isothermal density profile. This paper demonstrates our ability to measure
ensemble cluster masses from SDSS imaging data.
