A leader which is used to pull a seamable papermaker’s fabric onto a paper machine comprising a ravel area for securing pull ropes or cables thereto. Key aspects of the method involve a step of controlling a moveable part to move within a predetermined focusing area, a step of processing consecutive images to obtain definition values of the consecutive images, and a step of calculating a focus location of the consecutive images. The ping control metric may be a user-defined metric that is a function of predicted signal-to-noise ratios and predicted target tracks, and may contain aspect dependent target strength and target position and velocity data for a particular potential ping time. The continuous flow microreactor comprises one or more individual fluidic modules each having various features with respect to channel width and thermal management.