  We have investigated 1008 objects in the area of five intermediate age open
clusters (NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756) via the narrow
band Delta a-system. The detection limit for photometric peculiarity is very
low (always less than 0.009mag) due to the high number of individual frames
used (193 in total). We have detected six peculiar objects in NGC 6705 and NGC
6756 from which one in the latter is almost certainly an unreddened late type
foreground star. The remaining five stars are probably cluster members and bona
fide chemically peculiar objects (two are lambda Bootis type candidates).
Furthermore, we have investigated NGC 3114, a cluster for which already
photoelectric Delta a-measurements exist. A comparison of the CCD and
photoelectric values shows very good agreement. Again, the high capability of
our CCD Delta a-photometric system to sort out true peculiar objects together
with additional measurements from broad or intermediate band photometry is
demonstrated.
