Thanks, , when you get the time , are out and about shooting and its no headache. Ill look forward to seeing this, I know when I got my canon Sx , that I was all impressed by the magnification ,It helps cure a host of ills as long as the sensor is up to snuff. I can ID a bird heck ! a quarter mile off sometimes! but in the application, to get pictures of nice smoothness and feather detail ,,that was another thing altogether. I had to sacrifice the raw files for the full zoom , I had much more chromatic aberration and the dynamic range dropped a lot. The keyhole viewfinder and the electronic lag really is difficult for birds in flight or even just jumping around in bushes. I think you have to be even
more savvy to shoot well with the bridge cameras , but they are less heavy, less bulky, less expensive ,apply over a broader range of magnifications ,have greater depth of field, heck I think the d900 even has wifi, and shoots more frames in that first second than my 7100. But but but , with the 7100 plus tamzooka, I can zoom to 600mm without losing anything , It is not visibly softer IMO , then with the crop sensor Im up to 900mm 'equivalent' and I can crop in down to about a third of that.
Comparing the ISO performance of sensors of strongly differing sizes and efficiencies, is
not an equal comparison. The arrays fill sooner on the smaller sensor and one applies less ISO amplification ,
for a given amount of incoming light , (which would be a good thing , except the obscuring visibility of noise goes up and the dynamic range goes down).
One has to compare pics between bridge cameras vs DX or FX cameras on a much
broader basis which encompasses all the compensations and adjustments of actual use. Hence,, I created that 'one dollar challenge'