Here are two types of Environment HRDI probe, but what types are they, and can you show examples of other types?
The second looks about right using equirectangular in Cycles, but then again, so does the first, sort of… Yet both look wrong when set as mirrorball.
This is the type of image I find classed as a mirrorball: http://www.google.co.uk/imgres?q=mirrorball+hdri&hl=en&client=firefox-a&hs=mRm&sa=X&tbo=d&rls=org.mozilla:en-US:unofficial&biw=1920&bih=860&tbm=isch&tbnid=txacvYXvVfr6vM:&imgrefurl=http://commerce.vismasters.com/catalog/products/hyperfocal-hdri-environments_4407.aspx%3Fproduct%3D4407%26view_selection%3DFeatures&docid=V7tO3dkFCRrIeM&imgurl=http://commerce.vismasters.com/redir/images/%3Fimagetype%3Dfeatures%26image%3Dsku1014-1146/hdri_01.jpg&w=585&h=296&ei=6iYiUbz1O4WttAbqq4HgAw&zoom=1&ved=1t:3588,r:47,s:0,i:232&iact=rc&dur=799&sig=116542717789289132396&page=2&tbnh=160&tbnw=311&start=32&ndsp=38&tx=130&ty=96
This the Wiki entry for Equirectangular, http://en.wikipedia.org/wiki/Equirectangular_projection
So, are both my examples wrong? (The first being somewhat equirectangular?)
For completeness here’s a few links I found whilst searching BA