... Grabbing a guider image . Guider focusing . ... Engineering data on the guider performance . ... Past reports of guider performance and comments on guider requirements . Searches for correlations between guide errors and other parameters . ... The first section of this report is geared to inform a normal user of the telescope about the general capabilities of the 3.5m guider. ... Guider Focus . ... In the case of Figures 4 and 5, we have a total tracking error of 0.23 arcseconds on the guider. ...