Bob,
no direct experience with any of these cameras, I have used a few
different super zoom cameras. I would suggest that just judging on MP
really won't tell you much, these cameras are made possible by using
very small sensors which fundamenatlly limit what they can do,
cramming more pixels on does not really help anything other than
filling your hard drive quicker. What is more important is the
quality of the sensor overall. I'd suggest having a look at his link:
http://www.dpreview.com/reviews/sony-cyber-shot-dsc-hx200v/7
you can scroll down and select the Canon and the Nikon from the drop
down menu and download full size test images from each camera to
compare for yourself.
I would suggest basing your selection on handling and in particular AF
at high zoom settings. They all go to crazy high focal lengths and
I'd suggest that handheld even with IS anything much past 600-800mm
equivalent is going to be difficult. The reviews also comment on AF
performance, here's the links to appropriate pages for the cameras in
question:
http://www.dpreview.com/reviews/canon-powershot-sx50-hs/6
http://www.dpreview.com/reviews/sony-cyber-shot-dsc-hx200v/6
http://www.dpreview.com/reviews/nikon-coolpix-p510/3
Suggest you browse the reviews. A few things to look for include
whether a paper manual is provided (not with Sony) if a separate
battery charger is provided (not with Sony). On telephoto AF
performance the Sony seems to get good marks, which I think is
important, these cameras generally get sluggish at max zoom and can be
a challenge to get them to focus on the right thing at times. Hope
that is helpful,
regards,
Chris Ross
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