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The images were taken in rural areas, large parks and other similar environments. A filter by time of day or weather conditions lets you select the desired 360-degree sky HDRI.
Registration is required before downloading, but it is also free. An ultra-high-resolution version of the HDRIs (13,000 x 6,500 pixels or 15,000 x 7,500 pixels) can also be downloaded for a fee of 5 euros for a single HDRI or 50 euros for a package of 20.
Here you can download the HDRI skies after registering.
All further information: hdri-skies.com
