I thought it was a Dalsa but wanted to be sure. The Kodak chipped H4D40 will preform much better at high ISO [...] than a Dalsa chipped camera partly because the chip in the 40 and partly because Kodak chips always perform better at higher ISOs [...]
The difference in high ISOs is almost entirely because the Kodak chip includes microlenses which increase the native ISO of the back a full stop (very cool) but make it unsuitable for use on a technical camera or with strong tilts/shifts (by the owner or someone they want to sell it to in the future) and also raises the base ISO (so you can't use it at ISO50 for e.g. cutting down ambient daylight when shooting outdoors with flash). The H4D-40 does significantly outperform the DM40 at ISO800 (and has an ISO1600 option to boot). So if you need higher ISOs then the DM40 is not right for you.
Then again you're using the Sinar 54H now so that implies to me you're not especially concerned about high ISOs and would use another tool (e.g. a dSLR) if you needed e.g. ISO1600.
It should also be noted your DM40 can sync up to 1/1600th when using one of the leaf shutter lenses (including 1/1600th wirelessly while no 'blad wireless solution that I'm aware of can fully use 1/800th) in addition to shooting up to 1/4000th with the focal plane shutter.
You should also download and try both Phocus (hassy) and Capture One (phase) as you'll only get the most out of either option by using the manufacturer software for the raw conversion and consequently you'll be spending many hours with one or the other once you buy the camera. Doesn't hurt to have a dealer for each step you through the software so you see the software from an expert's point of view first (which you'll become after some usage, but will not be when you first open the software).
Doug Peterson
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