Hi Guys, I am a Photoshop CS6 user and already know how to use Adobe Camera Raw. How does Lightroom differ from ACR. Is Lightroom basically the same program as ACR? The reason that I ask is because I am considering doing an HDR course and have been told that I will need to buy Photomatix (ok, I can understand why) and Lightroom. I am not wanting to buy (and probably don't want to spend the money) Lightroom if ACR is similar. Any thoughts or help would be greatly appreciated.