I just took a ton of still pictures for a home staging/real estate portfolio, and when I downloaded them on my computer 90 percent of them are fuzzy (not blurry, just not sharp). I just realized I too

SOURCE: Blurry Viewfinder

There is a small sliding lever on the side of the eyepiece to adjust the built in diopter for your eye.

SOURCE: I have the Nikon D60 - Ive taken sport/action pictures

The main difference between the two shooting conditions is the amount of light you have to work with. For the indoor action shots, set the ISO setting to the highest available through the menu (1600 ISO) to maximize the ability of the camera to work with the diminished light. The other (but more expensive) way to achieve better indoor shots is with the use of a "faster" lens, ie one with a lower maximum f stop number (f2.8 is faster than f3.5, for instance). Also ensure you are shooting with your lens at its widest f stop setting (lowest number).

SOURCE: when the camera is on sport mode all pictures are

This rather odd as the "Sport" mode should cause the camera to use faster shutterspeeds in order to stop your subject from blurring.

I can think of two issues here: First, in order to get faster shutterspeeds the camera uses a larger lens open to let more light reach the sensor. This results in less depth of field and makes accurate focus even more important. It also may be that the "Sport" mode defaults to "Continuous" focus which will allow the camera to fire before the subject is in focus.

The other problem could be that you are using a low ISO setting which results in slow shutterspeeds. If you are shooting outdoors try setting the ISO to 400. Indoors, you will need to go to 800 or even higher.

The one that I really must stress is that you should read the manual. There is always some information on how each mode works and how each should be used.

If all else fails: Switch to A, "Aperture" mode and set the camera to use the lowest number f-stop (displayed as "Fn.n" on the camera's top LCD. This may work better for you in any case.

SOURCE: Nikon D60x Blurry night pictures

Try switching to Shutter Prority (S) with a fast shutter speed.If the light is not so good, up the iso to 800 to gain that faster shutter speed..

You do not say the lens in use ? if VR, make sure its switched on or use a tripod.

Hope this helps

SOURCE: Lack of definition, blurriness.

Experiment with lowering the "exposure compensation" setting until you get the desired results. Also, don't forget to use a tripod.