HDR sky dome in .hdr format to use as a spherical environment in 3d scenes. The HDR has a very high dynamic range for great looking realistic shadows from the sun, with extremely detailed volumetric clouds.
6000px wide, it is great to use as the actual background. When you import in your 3d package use a liniar color profile for a more even light, or use a sRGB profile to get a dramatic look.
Hope you enjoy and please rate.