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I also tend to prefer natural light than flash when photographing both people and pets. (One of the reasons that I love the G7 is its Image Stabilization. This allows me to shoot handheld at much slower shutter speeds. Of course, it also assumes that my subject is not moving.) This is just a personal preference and I have seen many wonderful portraits using flash setups. However, most of the really good ones are using multiple flash heads such as are used in a portrait studio.
If you must use a flash – for example because of insufficient indoor lighting – the one on the G7 does get the exposure right most of the time. However, the results are generally rather harsh and not very flattering as it the case for 99% of the built in camera flashes. One of the big advantages of the G7 is it is one of the few point and shoot cameras to have a hot shoe. This will allow you to utilize one of the larger Canon flashes that allow for bounce flash would work much better.
Even the 220EX Flash (the one that I purchased) gives better results than the built in one. It is more powerful which will allow you to get further you’re your subject and still get good exposures and since it is raised above the camera it tends to avoid the dreaded “red eye” (or actually yellow eye in pets) that built in flashes tend to give. If you really wish nice results, the larger flashes from Canon (the 430EX and 530EX) have tilting heads, which allow you to bounce the light off a wall or ceiling.
Another technique, one that I have not tried yet with the G7, is to put something over the built-in flash to defuse its light. I have utilized opaque tape or white paper on other small cameras in the past. Obviously if your only flash option is the built in one, just use it. Getting the shot is much more important than no shot at all.
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