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The image quality from Ground-Layer Adaptive Optics (GLAO) can be graduallyincreased with decreased contiguous field of view. This trade-off is dependenton the vertical profile of the optical turbulence (Cn2 profiles). It is knownthat the accuracy of the vertical distribution measured by existing Cn2profiling techniques is currently quite uncertain for wide field performancepredictions 4 to 20 arcminutes. With assumed uncertainties in measurements fromGeneralized-SCIDAR (GS), SODAR plus MASS we quantify the impact of thisuncertainty on the trade-off between field of view and image quality forphotometry of science targets at the resolution limit. We use a point spreadfunction (PSF) model defined analytically in the spatial frequency domain tocompute the relevant photometry figure of merit at infrared wavelengths.Statistics of this PSF analysis on a database of Cn2 measurements are presentedfor Mt. Graham, Arizona and Dome C, Antarctica. This research is part of theactivities of ForOT (3D Forecasting of Optical Turbulence above astronomicalsites).

The widest contiguous field of view at Dome C and Mount Graham