Y-Phil posted at 2:03 PM Mon, 11 July 2022 - #4441061

When it comes to EZDome: I'm using an HDRi on the external sphere and its JPG counterpart on the inner sphere: it's easier to position. I create the JPG  using Photoshop but I suppose that there are other optons as well.

Here's an example. The preview picture is most of the time a small one

There is a small app that can convert HDR to JPG if you are looking to use the same image for the EZDome: Easy2Convert HDR to JPG.  IIRC, will produce a high-res image.  

I noticed that your screencap is showing a low-resolution HDRI, be very careful with low dynamic range images, they are notorious for causing fireflies when rendered with SSS in Superfly.