  First preliminary results of the balloon-borne experiment SPHERE-2 on the
all-nuclei primary cosmic rays (PCR) spectrum and primary composition are
presented. The primary spectrum in the energy range $10^{16}$--$5\cdot10^{17}$
eV was reconstructed using characteristics of Vavilov-Cherenkov radiation of
extensive air showers (EAS), reflected from a snow surface. Several sources of
systematic uncertainties of the spectrum were analysed. A method for separation
of the primary nuclei' groups based on the lateral distribution function' (LDF)
steepness parameter is presented. Preliminary estimate of the mean light
nuclei' fraction $f_{30-150}$ at energies $3\cdot10^{16}$--$1.5\cdot10^{17}$ eV
was performed and yielded $f_{30-150}$= (21$\pm$11)%.
