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{anchor:mainControlsServoDelay}
h5. Servo (cusp) delay adjustable from *Main Controls*
The _Cusp (Servo) Delay_ control in the {link-window:ScanImage Pics^r3_5_AdvancedConfigurationGUI.png|type=popup}*Advanced Configuration...*{link-window} dialog box is linked to the new _Servo Delay_ controls which now appear on the {link-window:ScanImage Pics^r3_5_MainControls.png|type=popup}*Main Controls*{link-window} window. The new controls allow the user to adjust the Servo Delay without opening the *Configuration...* window. In particular, the value can be adjusted while live imaging in FOCUS mode. 
^(/) The *Advanced Configuration...* dialog box is accessible via *Settings >> Advanced...* from the {link-window:ScanImage Pics^r3_5_BasicConfigurationGUI.png|type=popup}*Configuration...*{link-window} dialog box. The *Configuration* dialog box, in turn, is accessible via *Settings >> Edit >> Configuration...* from the {link-window:ScanImage Pics^r3_5_MainControls.png|type=popup}*Main Controls*{link-window} window menubar.^

(/) The name _Cusp (Servo) Delay_ in the ScanImage 3.5 *Advanced Configuration...* dialog box replaces the name _Cusp Delay_ in ScanImage 3.0. The new name reflects the connection of the parameter to the mirror's servo driver's phase delay. 

(/) The _Servo Delay_ value is specified as a fraction of the _Seconds / Line_ value in the {link-window:ScanImage Pics^r3_5_BasicConfigurationGUI.png|type=popup}*Configuration*{link-window} dialog box.

h6. Adjusting the Servo Delay
The effect of adjusting the _Servo Delay_ is to shift the imaged area left or right. When the _servo delay_ is too (small/large), a 'reflected' image will appear on the (right/left) side of the image. The optimal _servo delay_ value is exactly between the values where these reflected images become apparent on either side.

(/) If it is not possible to eliminate the 'reflected' image with any value of the _servo delay_, try reducing the _Fill Fraction_ value in the {link-window:ScanImage Pics^r3_5_AdvancedConfigurationGUI.png|popup=true}*Advanced Configuration*{link-window} dialog box.
(/) ScanImage 3.6 will more completely address issues related to optimizing scan parameters{info}

{anchor:infiniteFocus}
h5. 'Infinite' FOCUS operation
An _Inf Focus_ checkbox has been added to the {link-window:ScanImage Pics^r3_5_MainControls.png|type=popup}*Main Controls*{link-window} window. Selecting this checkbox will cause FOCUS acquisitions to continue indefinitely until the user presses _ABORT_. When deselected, the ScanImage 3.0 behavior of scanning 80 frames before stopping is employed.

{anchor:bidiScanning}
h5. Bidirectional scanning