Originally posted by Nicolas06 I may be stupid, I get the improvement without PS, but for the test with PS, how offen do you guy plan to use pixel shift at iso 51200 when you already need tripod and stationnary subject ?
If I had a stationary subject and a tripod, then I wouldn't have to use ISO 51200. I would rather use ISO100 and pixel shift for a number of reasons.
1. Better resolution means more room for cropping. For instance I may choose a lightweight wide angle prime in stead of a slower and heavier normal zoom. At short focal distances I may "zoom" with my feet. At longer distances I may crop slightly more and still get good results. Leaving heavy zooms at home (or not buy them in the first place) makes the trip lighter and more pleasant to hold the camera for longer periods.
2. Having the ability to print larger is also an advantage. I may not do that often, but I want to be able to. If I knew I would never print large I would probably buy a compact camera in stead.
3. Another reason is that my tele lenses will "reach longer". My longest tele are a 2,5 kg 300mm and there may be times where I would rather have a 400mm, but if PS does that for free, I will be glad not to pay for that 400mm and carry its weight. The 300mm are sometimes left home because of weight and I would just be happy if my lighter lenses "reach longer". Even if its just by a small factor (1,2x or so)
ISO 51200 is for those times when I shoot moving subjects in dim light and don't have a tripod. For example indoor sports from a standing position in the crowd. PS may still be useful to reduce noise in the stationary background, but I don't plan to use it in such conditions because of low shooting rate and huge files.
In other words I agree that the ISO 51200 PS comparisons have limited practical use, but I don't agree that rare 100" prints are the only situations that PS are useful.