Full Disclosure: as stated in my signature I am the Head Tech at a Phase One dealer.
Roman, I set up a quick shot using a P30+ on a Hasselblad Body with a wide prime (35mm) while I was packing to go to Ohio for the weekend.
P30+ ISO100-2min
P30+ ISO200-1min
P30+ ISO400-30sec
P30+ ISO800-15sec
I am about to leave for the airport so I will try to get the raw files uploaded for you while at the airport, but no promises.
I think you'll be doing yourself a grave disservice if you invest in a system without testing it specifically for your needs. Each system has it's own strengths and weaknesses. For instance I strongly suspect you'd be very disappointed with the P65+ if you wanted to use it very often at night. At ISO800 for 30 seconds the P65+ performs poorly. The P65+ is, generally speaking, produces the best raw file of any single-shot digital back and performs extremely well at ISO1600 (with 3200 being usable depending on your usage/needs) but it does not perform well for long exposures when combined with high ISO. This sort of thing is why it's critical that you test your potential investment in the situations you'll actually use it in.
At a technical level, the maximum long exposure for any given camera system is not the same at each ISO. For instance a P65+ can exposure cleanly for around a minute (temperature dependent) at ISO50 or ISO100, but at ISO200 I wouldn't go past 40 seconds.
With the P30+ and P45+ the maximum exposure is around an hour (temperature dependent) at ISO50/100 - plenty of headroom when using ISO200/400 to do long exposures.
If you continue to do research, and then do your own testing, I think you will find the P30+ and P45+ are widely regarded, and live up to, the claim of the kings of long exposure.
ISO800 with a D3X is also a file you will very much want to look at before you make any decisions.
I'm sure there are many people here interested in your results if you continue to research and especially if you do your own testing. We'd be happy to provide you a P30+ for free in-person or on a cheap rental (which could be applied towards a purchase). We have a demo P30+ for sale at $8500 with warranty and dealer support.
Doug Peterson (e-mail Me)
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Head of Technical Services, Capture Integration
Phase One, Leaf, Cambo, Canon, Apple, Profoto, Eizo & More
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