ASIAIR does not work correctly when the same model (in this case ASI585mc -- I have two of these) camera is used for both the Main and Guide Camera. First, its hard to choose which is which, but you can force it if you unplug one of them first. However, once you get it set correctly, (i.e., which camera is the guide, which is the main), the NEXT time you use ASIAIR it deactivates the Guide camera setting (icon is gray) because ASIAIR is confused about which camera is which. Restated, next time you use ASIAIR it won't automatically set the Guide camera is it normally would (it goes gray) requiring you to re-setup the correct camera on the guide side.