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Question: Compared to the Nikon P520 and the Sony FZ200  which might be best for low light image stabilization,portraits and pics of our dogs - thanks!
Document: I would recommend this camera because I believe its the best in its class compared to the Canon SX50 and the Panasonic FZ70 which I did own. The Nikon P520 is competition as well. These are all great cameras but I prefer the HX300 over all of them. One thing I would recommend.....Take a look at all the features and specs and do a comparisom with other power zoom cameras and you will see this camera ia a powerhouse of features.
I received this camera a week before our annual golf tournament in Myrtle Beach and the caddy-master took our best group shot with it with no prior instruction, thanks to image-stabilization software. It sure beats my first  Kodak &#34;Brownie&#34;... After I got back and downloaded what I had, I saw a commercial on TV for a Microsoft cell-phone with a built-in 40 megapixel camera! Is there no end to it?
The best analogy would be to compare the results to using a fine pair of Monarch model binoculars for birding compared with a decent low price pair. With the lower-priced scope you will certainly see the bird and be able to recognize it but the image will lack crispness and richness of color.
I just wasn't impressed with the cost of the cameras and additional lenses. I think the Sony HX300 is capable of so much for such a low price ($418.00 compared with the cost of the SLR's). They run anywhere from $540 to over $1000 by the time you buy a additional zoom lens. The HX300 is great in low light situations because it can go all the way up to ISO 12800. The SLR's can do that for a much higher price for the bigger sensors.
With that said, the difference is best described as noticeable but not overwhelming as I might have expected. I have shown these comparison images to several photographic friends and all have expressed amazement at how well the Sony HX300 image quality holds up in comparison to the much more expensive Canon equipment.While at the lake I also had the opportunity to try out the Sony on some real "action" situations. A blue heron flew past and landed about 150 yards from me.
More than I expected. I am a point-and-shoot person. I take many pics on my job and I've only had a couple of bad shots. Excellent low light shots. Great zoom too. Took HD video of my granddaughter's Christmas play from the back row - couldn't tell it was a distance shot.I did buy a new lens cap with a tether cord. The one out of the box does not have a tether cord.
This was indoors during the day in the morning on a cloudy day in a mid-size room with all room lights turned on for assistance. I was about 6 feet from the subject for most of the shots. This set up was chosen to enable a lot of light on the subject and surroundings. It resulted in the best indoor, daytime "people" pics I have achieved so far with this camera.
I have taken some stunningly sharp shots, including macro, near zoom, and distant zoom ones under the aforementioned favorable conditions. The inherent camera focusing system seems to "love" (perform best in) the high contrast, bright light scenario because it seems to work its best then regardless of zoom setting to produce very sharply focused pics.
Some of the reviewers are disappointed with the quality of pics at full zoom. I got my lesson while taking a picture of the moon: even though I used a tripod, I could see the image shaking from even the lightest vibration and wind gust when focused on the moon. I placed my camera on 2 second delay (with tripod of course) to get the best results. The auto-image stabilizer really does a great job - otherwise all pics would be shaken.
All about the zoom and getting close to wildlife. Lots of features, good build quality, great viewfinder and video, Great color, only thing I wish it had GPS. (Update) I have been able to take 50x shots hand held that are sharp, but a monopod works great. Hand held twilight mode is very good for low light shots and Sony's HDR implementation is one of the best if you use a tripod.
Answer: http://www.photographyblog.com/reviews/nikon_coolpix_p520_review/image_quality/I havent tried the Nikon but this Sony is pretty good in low light video , no zoom noise ,its pretty quiet . But I believe for big portraits, full fledge photographers wont recomment this Sony model but I wont be blowing up pictures with this camera.The Fz200 is a panasonic model has a shutter speed of 15 seconds while Nikon is 8 seconds, so I would say Nikon is better but Sony has 4 seconds shutter speed , so for night photgraphy  Sony is the best in the group .