I have an issue of getting similar color of background as the subject, most of the time (not all) the image comes out like this, the water in the background is certainly not the color it captured in the image, is it issue of using wrong white balance or something else? i have many images which has this issue, can someone guide me? by the way, i am using Nikon D3300 & Sigma 150-600mm sports
After looking at your RAW, nothing seems wrong with your camera. The White Balance might be a little off, but it really depends on what you want to do. Each color channel is fine and I see no trick due to bad interpolation during the RAW development.
You have been shooting at 1/30 F/9 ISO 1600. As the image is correctly exposed, you were probably shooting with low luminosity (Ev100 about 7) so maybe 2 phenomena appeared:
- artificial light might have messed up with the color
- your eyes were adapted to this light and tricked your color perception (see How can knowledge of human perception of color be used in photography?).
If you want to be sure about your camera, you might want to calibrate it (see What do I need to photograph paintings with accurate color? and How do I ensure good color reproduction when photographing paintings with a mid-level DSLR? for some explanation about camera calibration).
As a side note, your image isn't very sharp. I know that the Sigma 150-600 at 600mm is sharpest about f/11 (see photographyblog.com), but 1/30 seems really slow, even for a sitting duck. You probably have encountered motion blur and/or camera shakes. Given your low light condition, you might have gotten a better result at f/6.3... but your duck is still nice :)