Hi Peter,

There are two ways to invoke calibration. You can set the ACP Preferences (Imaging tab) and that will ensure that every image is calibrated throughout the entire evening, or you can use the #CALIBRATE directive in a plan. Note the caution below, however.

There is also a #STACKALIGN directive that is used in a plan to stack like images. You can read about directives in the help file. Briefly, from the help file:

"[#STACKALIGN] combines repeated images within one filter group and aligns images into a single image. Individual images used in the stack are preserved. File names will have STACK in place of the repeat number. Use this for all stare-mode image sets. The stacked image is saved in IEEE floating-point FITS format to preserve the dynamic range."

NOTE: that #CALIBRATE and #STACKALIGN act only on the next target after which they appear, so if you want to do this for many targets, you will have to have these directives in front of each target.

For example:

...
#CALIBRATE
#STACKALIGN
#FILTER Red,Blue,Green
#INTERVAL 10, 6, 4
#COUNT 12, 15, 13
#BINNING
M 64 ; the target
...

This will produce a stacked image for each of Red, Blue and Green images.

As I mentioned above, if other targets follow and you want to do the same thing, you have to essentially repeat the above lines for each target.