Had the wrong lens for these shots (Canon 70-200) so I set it to 70 and moved as far back as possible.
Also didn't have my Speedlite flash so had to use the camera pop up flash. Manually set camera to 1/250 F8 Iso 400 Flash -1/3.
Some problems with interference patterns from his boiler suit (coveralls) but managed to reduce the problem during editing.
I had to let the midtones/shadows go a bit on the dark side when shooting; but created two Raw conversions with different exposures then combined them.