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Natural lighting is everywhere around us (in the daytime). The sun is an excellent source of light because it is so plentiful and readily available. This can also cause some real problems if you do not use the sun to your advantage. The best time to take pictures outdoors is right after sunrise and before sunset because this is when light is the softest. The worst time is during the middle of the day when the sun is overhead creating harsh shadows. Alternatively, a cloudy day is good for taking pictures because clouds diffuse evenly diffuse sunlight and create pleasant lighting conditions. When taking pictures of your dog outside, it is best to position the sun so that it is coming from one side of your dog. By lighting one side of the dog, you create a greater depth and make your photos livelier. They tend to pop and catch your eye right away.
In the example to the left, the sun was positioned to the side which provided a nice catch light in the eyes, lit one side of the dog, and consequently showed off the dog’s beautiful fur. A wide aperture (smaller f number) was also used to separate the dog from the background (grass) and help freeze the action.
Rusthy the black dog by Tambako the Jaguar.

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Indoors, less lighting is available so you should make the most of it. Photograph your dogs next to a large window that does not have direct sunlight pouring in it. A north or south facing window works great for providing nice soft diffused light, perfect for portraits of both pets and people!
Morning Sierra by Phil Romans