Nikon D300 User Manual page 128

D300S tells me it can store a whopping 4,300
basic files on my 8-gigabyte CF card.
Note: It's hard to specify an exact number of images that a
particular card size will hold. My D300S reports that a little
over 300 lossless-compressed
an 8-gigabyte memory card, yet when the shooting is
finished, I often have over 500. With JPEG's higher
compression ratio, it is even harder to predict exactly. Image
complexity has a lot to do with final compressed file size.
That's why the camera under-reports the number of images it
can hold. You'll find that your memory cards will usually
hold many more images than the estimate presented by the
camera.
JPEG (Joint Photographic Experts Group) is used by
individuals who want excellent image quality but have little
time or interest in post-processing or converting images to
another format. They want to use the image immediately
when it comes out of the camera, with no major adjustments.
The JPEG format applies your chosen camera settings to the
image when it is taken. The image comes out of the camera
ready to use, as long as you have exposed it properly and
have configured all the other settings appropriately for the
image.
Since JPEG is a lossy format, one cannot modify and save a
JPEG file more than a time or two before compression losses
ruin the image. However, since there is no post-processing
required, this format allows much quicker usage of the image.
A person shooting a large quantity of images, or who doesn't
have the time to convert RAW images, will usually use JPEG.
That encompasses a lot of photographers.
NEF (RAW)
128
JPEG
images will fit on