Very natural photos
Fantastic big lens rivalling the best lens in my memory (e.g. Nikon micro's)

No IS (as everyone has noticed), so long shots require a stable foundation
Slow focus at long end; generally slow focus anyway compared to something like the Fuji S9500--now if Fuji could just build a lens like this one)

I agree with the review posted here (rather less with the one on DPreveiw). I simply wish to point out something that no one has said:
the Pro815 has a WIRELESS remote (infra-red, so need to operate in line of sight in front of the camera)
who else has a wireless remote? Olympus for some models
the just announced Pentax K100 has a short wired remote, better than nothing, but pretty stupid in the wireless age
why is it important? I had an advertising shoot in an office involving photographing both facilities and personnel; the wireless remote made it easy to distract people and obtain candid shots
I completely agree that you MUST use custom white balance indoors (but it is easy to use simply a piece of clean white paper).
I agree that often you will want to use ISO50, meaning a tripod unless it's bright sun.

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Similar Products Used:

Fuji S9500
Panasonic FZ-20