Fall & Spring Semesters. 1  Undergraduate students must be enrolled in at least 12 credit hours to be considered full time and enrolled in at least nine hours in order to be three-quarter time. 2  Enrollment in six to eight hours is considered half time and enrollment in five or fewer hours is considered less than half time.
Yep you've got the abbreviations right. Av = aperture value = aperture priority auto exposure Tv = time value = shutter priority auto exposure Both of these modes allows you to set a firm value for either aperture or shutter speed, and let the camera work out the exposure needed.
On both Nikon and Canon digital SLR camera's, the exposure compensation button looks like a plus and minus sign (+/-). On a Nikon D40, this is situated near the shutter button. For Canon 400D it is found upper right to the LCD screen on the back of the camera. Example of exposure compensation button: