  We present first results of a simultaneous atmospheric turbulence measurement
campaign at the Calar Alto (Spain) 1.23m and 3.5m telescopes. A SCIDAR
instrument and the Calar Alto Adaptive Optics system ALFA were used at the
1.23m and 3.5m telescopes respectively to determine essential turbulence
parameters like the Fried parameter r_0, the isoplanatic angle theta_0, and, in
the case of SCIDAR, the C_n^2 profile of the atmosphere. Both closed-loop and
open-loop data were obtained with ALFA. The desired parameters were then
calculated from this. This paper shows a comparison of the results obtained
from the two different systems for several times during a period of three
nights.
