OK, here’s your free HDRI sky sample!
Download it here Free HDRI Sky Dome.
Due to the very high dynamic range captured in these HDRIs, we recommend high importance sampling, unbiased or brute force rendering techniques.
Let me know how you go with the samples or the tutorial. I’d also be very grateful if you could return the favor and help me spread the word about the free samples, whether that’s by mentioning you used the sample HDRI in a blog or gallery, or by tweeting it, or sharing on facebook.