Phase One recently released a new firmware update for the P 40+ and P 65+ digital backs. After completing my own test, I definitely recommend running the update for those using these backs. I tested it by capturing up to a minute, which is the maximum time Phase One recommends with the P 40+ and P 65+. I took a picture of the same object without moving anything - only changing lights and shutter speed and I must say that this new firmware surprised me. The image quality improvement really stands out and will expand your options greatly. You can see in the images below how good the quality is.
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