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Typically shooting wide open @ 2.8 in studio, trying for a narrow DOF and a creamy bokeh can be challenging and most of the time unsuccesfull with most strobes. Some try ND filters but focusing is a challenge, extra diffusion material can help, and I've even heard of some people using window tint to cut down on strobe power with marginal success.
Moving the light back can help but then you loose the big light / soft light source on your subject.
Tonight I continued to experiment with the Profoto Pro B4. I took advantage of Profotos "Freeze mode" which allowed me to drop power to "1 watt second" ( flash duration was still at 1/11,000) Long story short, D3S with 85 1.4 G, shot wide open @ 1.4, 125th shutter speed at ISO 200, not 100, a Profoto 3x4 soft box set less than 2 feet from subjects head and I ended up with a perfectly exposed shot with beatifull soft light. This now adds another seamless dimension in the studio for me using strobes that I was only able to get with natural light outside of the studio. IMHO, The Pro B4 is another home run for Profoto.