I have a P21 back and I do have a spare Mamiya body but I don't want to spend out on a spare back so I was thinking of getting a 5D as a backup camera. I remembered a review of Michaels saying he thought the 40D was as good as the 5D and it seems the 450D is as good as the 40D and therefore also the 5D, with regards to IQ that is. Maybe the 450D is the perfect if a little unexpected, backup camera? Am I missing something or can I get away with saving a bunch of cashola?
Obviously the best backup for a digital back is another digital back, if your trying to match the look of sharpness and the same color response.
A lot of people won't do this for cost, or useability.
The Canons are great cameras though matching a p21 to a Canon under most circumstances takes a lot of post work. Maybe it's the AA filter but it does look different, not bad or wrong, just different.
The closest I've seen to match my phase backs is the Lecia, probably because it has a Kodak sensor and doesn't have an AA filter, though obviously it is a much different camera and it doesn't go to high iso very well as anything over 250 starts to get challanged, much like the backs.
Maybe I'm the only person that would like a higher iso back, but I believe there is a big hole in the market for the 5d of digital backs, something like a p21 that goes to 1000 iso.
Even if it's native response started at 400, you could always add nd's in a pinch, but a 400 to 1000 iso back would make that investment more than just something that sits in the case for emergencies only. It would make spending another 10 to 12k worthwhile.
Given all of this there is probably more 5D's in camera bags as backups as any camera.