How do I disable the flash on a D 70s so I can take natural light photos?

Instax 25 Fujifilm Camera Tutorial and Reveiw check the manuals and buttons behind the camera it self.. the number of times the button pressed gives different modes.

The newer ones had more horsepower, better brakes and safety equipment. There are several cosmetic differences that you can see by looking at photos.

Use natural light or a ring flash. An onboard or mounted flash will alway produce a short distance shadow.

in darker settings your chip will imitate a slower film speed.  The aperture will remain open longer (than it would in bright light) to allow enough light in to the light sensitive chip.  Small movements of your subjects would show as fuzziness.  If you change your setting to sports or action setting the speed will be faster and there will be no blurring.  Then you will have a light issue so use a flash.

Do you have the ISO on auto ISO or do you have it set on a high number?

Try change the exposure of the camera: start the camera, set the dial to 'I' (automatic iso), then press the 'up' menu near the display until 'exposure' settings appear. move the slider to the left/right, according to your preference.
I reccomend using the automatic iso for taking pictures, it automatically adjust exposure.

The circle of light is almost certainly a reflection from either the flash, a lamp, the sun, or some other source of light since it only occurs with glasses. Try to eliminate possible sources for the reflected light. If you find that the flash is causing the problem, then the camera should be set to eliminate the flash going off. You can do that by selecting "no flash" if there is enough natural light. You many need to use the largest aperture and a tripod because low light will require long exposures, and any shaking will blur the photo.

Guys,
you need additional flash or brighter light to click in low lighting condition. In order to compensate for low light conditions, the shutter goes slow and therefore you get fuzzy pictures.

Another way is to click on movie(video) mode and then atleast you can see them moving around as well as while editing, you could take out some pictures from the video( though on lmuch ower resolution).

maybe you use wrong white balance, test auto and manual white balance; if there is pink again then your camera have hard ware problem (CCD for exaple). I hope this helps...

You have your ISO setting far too high - set 100 or 200 and get a magic improvement immediately !