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Residuals of a conventional plate adjustment of 5,687 plates of the SecondCape Photographic Catalogue (CPC2) using the Southern Reference Star (SRS)Catalog were analyzed to search for systematic errors depending on the locationof the star images on the plate. Even after correcting for third order opticaldistortion, such coordinate depending systematic errors, hereafter called fielddistortion pattern (FDP), were detected which are nearly constant with respectto plate epoch, location in the sky and apparent brightness of the stars. Themean amplitude of these field distortions was found to be 57 milliarcseconds(mas), which is $0.57 \ \mu m$ on a plate. Due to the favorable 4--fold overlapobserving principle of the CPC2, the effect on the mean catalog position isonly a fraction of that. But the FDP affects a block adjustment (BA) of theentire set of data on a 100 mas level at the border of the CPC2 sky coverage. Acomparison with FDP's found in other projects was made and physical reasons forthe FDP were investigated. Publication of a new release of the CPC2 is plannedafter the Hipparcos Output Catalog becomes available in 1996.Comment: paper for March AJ, LaTeX with 1 tabl

Field distortions in the CPC2 plate data