  Online Digital Sky Survey (DSS) material is often used to obtain information
on newly discovered variable stars for older epochs (e.g. Nova progenitors,
flare stars, ...). We present here the results of an investigation of
photometry on online digital sky survey material in small fields calibrated by
CCD sequences. We compared different source extraction mechanisms and found,
that even down near to the sensitivity limit, despite the H-compression used
for the online material, photometry with an accuracy better than 0\fm1 rms is
possible on DSS-II. Our investigation shows that the accuracy depends strongly
on the source extraction method. The SuperCOSMOS scans, although retrieved with
an higher spatial resolution, do not give us better results. The methods and
parameters presented here, allow the user to obtain good plate photometry in
small fields down to the Schmidt plate survey limits with a few bright CCD
calibrators, which may be calibrated with amateur size telescopes. Especially
for the events mentioned above, new field photometry for calibration purposes
mostly exists, but the progenitors were not measured photometrically before.
Also the follow up whether stellar concentrations are newly detected clusters
or similar work may be done without using mid size telescopes. The calibration
presented here is a "local" one for small fields. We show that this method
presented here gives higher accuracies than "global" calibrations of surveys
(e.g. GSC-II, SuperCOSMOS and USNO-B)
