Some time ago I did a bit of HDRI testing on an old scene.
The HDR images I have used are from Vizpeople – on their website you can find the HDRI V1 collection in a non-commercial version all for free. These are provided in 6000×2900 resolution. For 50 Euro you can buy the updated version that provides 4 times the resolution at 12000×5800.
The higher resolution will provide better reflections, as well as a much sharper background. However it doesn’t influence the light quality much.
I have become very fund of using HDRI for everything – so in my current workflow I always use the High-Res HDRI for the background as well – this ensures a higher level of realism and better integration between the scene light and background. – But it demands the HDRI is at minimum 1o000 px wide.
I will not go further into the use of HDRI , but perhaps I will do a small tutorial one day.
Until then, you can download the free HDR images by following the link below, and do some fun testing on your own!
Have a great weekend.