I was wondering, in DSLRs, there's a somewhat clear correlation between the pixel size + microlenses with ISO performance, of course given the same or close technology. Does it work with these DBs? For example, P30+ has microlenses, and it's ISO goes to 1600 and it performs well at low light. But its pixels are only 6.8 microns. P21+, on the other hand, also has microlenses, and its pixels are 9 microns, but its top ISO is only 800. I would, if anything, think it should perform better than p30+ in low light. No? Also, if people know, how does P25+ fits in into this line?
The p21+ and P30+ have a different look, almost like different films.
At 800 iso and pushed + .64 which gives in thoery 1312 iso. and by my subjective standards it looks good to me as it has noise that more resembles grain, and it seems more evenly distributed between midtones to shadows, without too much smoothing or chroma noise.
(the p21 was processed in V4 and must be set on high IQ for 800 iso.)
Now whether this is really 1312 iso, or if any camera is really correct at it's iso is another matter, but it does make me think that Phase could have a 1200 iso settng on the p21 and it would work.
We can all talk this iso thing to death, but the real and the only way to know if a back or camera works for what you do is to test it in the exact conditions in which you shoot.
Some work well under tungesten, some don't, some are fine at high iso and backlight, some are awful, some underexpose, then open up without chroma noise and some look like a billion christmas trees were put in the shadows, once again, use it in how you work, not how it looks in a dealers showroom, or just the controlled conditions of studio with 12 million watts of strobe.
Even in the days of film I've compared, Contax, Bronicas and Rz's all set at the same shutter and f stop and all at the same subject and their was a difference of nearly a stop between them and also a way different look coming from the contrast of the lenses used.
I believe in the worst case scenario thing, where you go into a shoot with a billion pounds of equipment but the the quality of the light coming from the windows is much nicer than anything you would construct. Can you just pull the pocket wizard, bump the iso and shoot it where it's sharp and useable?
At that point it really doesn't matter if the camera says, 400, 800 iso or 1200 iso, it just matters if it works.