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A 0.35\degr $\times$ 0.29\degr field centered at $l$=--18.63\degr,$b$=0.35\degr was observed during the ISOGAL survey by ISOCAM imaging at7$\mu$m and 15{\rm $\mu$m}. 648 objects were detected and their brightness aremeasured. By combining with the DENIS data in the near-infrared J and K$_{\rmS}$ bands, one derives the extinction at 7{\rm $\mu$m} through ${\rm A_{K_{\rmS}}-A_7= 0.35 (A_J-A_{K_{\rm S}})}$ which yields A$_{7}$/A$_{\it V}$ $\sim$0.03from the near-IR extinction values of van de Hulst--Glass (Glass 1999). Theextinction structure along the line of sight is then determined from the valuesof J--K$_{\rm S}$ or K$_{\rm S}$--[7] of the ISOGAL sources identified as RGBor early AGB stars with mild mass-loss. The distribution of A$_{\it V}$ rangesfrom 0 to $\sim$45 and it reflects the concentration of the extinction in thespiral arms. Based on their locations in color-magnitude diagrams and a fewcross-identifications with IRAS and MSX sources, the nature of objects isdiscussed in comparison with the case of a low extinction field in Baade'sWindow. Most of the objects are either AGB stars with moderate mass loss rateor luminous RGB stars. Some of them may be AGB stars with high mass loss rate.In addition, a few young stellar objects (YSOs) are present.Comment: 14 pages, accepted for publication in Astronomy and Astrophysic

The ISOGAL field FC–01863+00035: Mid-IR interstellar extinction and stellar populations