I discovered Light Stalking on Twitter, and highly recommend it to photographers.
I just received an email that Light Stalking is offering a free eBook to help understand how best to work with your camera’s depth of field settings. And they say:
While there is absolutely no requirement that you do this, it would be great if you could help us out by Tweeting, Sharing on Facebook or just emailing your friends to let them know about our new guide.
Nice.