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Have you considered using film for this application?no answer ?
anyone can send me a long exposure shoot by night let say several minutes in tiff or raw made with a P25+ ?
thanks
Who informed you of that? Those are certainly the largest differences (for most people's applications).I'm curious to know why there is a difference between, e.g. the P25+ and P25, in this respect. Is this a firmware issue?, meaning the P25 does not get any new firmware improvements? I was informed that the only differences between the backs (P vs. P+) were:
1. The brighter higher resolution preview screen.
2. Increased Iso range to 800 on P25+ versus 400 on non plus.
3. Plus versions have a live video focus/compose mode for use only when tethered to computer.
This is a real big deal for me (looking at entry at the low end), because I value the long-exposure of the phase backs, but it the P25 is really so bad, I'll have to think again .
Film also suffers from reciprocity, limiting your options, especially for color imaging to a select handful of emulsions. Each has it's limitations.Compared to any digital back it's really low in price and the quality you can achieve, especially when going for a larger format, can be better than any digital one shot solution. What you lose is convenience of course. It takes a few more steps to get to the final image with film. For me the results are really worth the hassle.
Yes, reciprocity failure can be a problem for film based photography on ultra low flux levels. The flux threshold for CCD and CMOS image sensors is much lower. It's a matter of quantum efficiency. In most cases that can be compensated by adding exposure time on film. But in some cases, e.g. astrophotography, a sensor is more effective in recording very low light levels.Film also suffers from reciprocity, limiting your options, especially for color imaging to a select handful of emulsions. Each has it's limitations.
To be honest, I haven't tried that combination myself. I have seen some long exposure samples from these backs (P45+ and P30+), some on this forum provided at web size by Guy and Jack, some at other places. One thing that I found odd about these samples was a mottled red channel. I have no clue what was done in software. I can only tell that this occurred on all the multi minute exposure samples I've seen so far from these Phase backs, even at web size.A P45+ (and to slightly lesser extent a P30+/P25+/P20+/P21+) with modern firmware and processed in Capture One 5 captures a shocking amount of highlight/shadow detail in a long exposure raw file. If you haven't used this combination then you haven't seen what digital long exposures can be.
Doug Peterson