www.fxguide.com/fxfeatured/the-definitive-weta-digital-guide-to-ibl

Notes:

• Camera type: full frame with exposure bracketing and an 8mm circular fish eye lens.
• Bracketing: 7 exposures at 2 stops increments.
• Tripod: supporting 120 degrees locked offsets
• Camera angle: should point up 7.5 degrees for better sky or upper dome coverage.
• Camera focus: set and tape locked to manual
• Start shooting looking towards the sun direction with and without the ND3 filter; The other angles will not require the ND3 filter.
• Documenting shooting with a slate (measure distance to slate, day, location, camera info, camera temperature, camera position)

NOTE: The goal is to clean the initial individual brackets before or at merging time as much as possible.
This means:

• keeping original shooting metadata
• de-fringing
• removing aberration (through camera lens data or automatically)
• at 32 bit
• in ACEScg (or ACES) wherever possible