When I add a custom HDRI of varying size from 8k-16k the image is blurry during preview and after rendered. I tried a very simple model with only a D5 building and different HDRIs. It does not seem to matter the resolution of the HDRIs I have even tried one that was 24k and it was no better in quality than the preview after rendered while the original images are much sharper. The HDRIs also seem to be very zoomed in. Even some of the included HDRIs and curated ones don’t look sharp. Not sure if I am doing something wrong, it’s a bug or it is just a limitation of D5. All test renderings were at 4k.
Hi, Try transforming the file you have from HDRI into JPG, see if it is blurry.
Thank you for your feedback. We will try to improve this issue.
I tried this one with a JPG and it is clearly lower quality than the base HDRI.
Hi, maybe I wasn’t clear, you have to take your HDRI and transform them with Adobe Photoshop into JPG or PNG with the characteristics of 4K or 8K HDRI, as you want so you don’t lose the pixel of the image so when you load it in D5 you will see the difference
No you were clear, the rendered image is using the HDRI converted to jpg.
Edit:
I will try it with a different HDRI to see if it does the same thing.
I did another test with a different 24k HDRI both using the original .HDR and converted to .JPG. See results, there is no difference in quality of the background but the light color did change.
However, this is a problem they have always had, but if you want to overcome the obstacle, try with the half sphere created by yourself, insert HDRI, then load it as an object, the image of the material, put it in D5 as Alfa, in this way it does not grain the 'image. that is until they solve the problem.
I salute you good work 
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Ok thank you. I will try that.
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