What does CA stand for in photography?

Chromatic aberration

PF= Purple fringe.

Both occur in lenses and photography and videography. CA is the orange/red color, purple fringe...well, purple :)

You will notice it in a lot of different venues. Like in some concert videos, the edges of an entire object will be purple- this is because the lens is really poor.

In photos/photo lenses, the effect isn't going to be apparent that much. It usually occurs when there are lots of highlights...things like tree branches.

-it only effects the edges of the photos, btw. The edge of an object, rather.

I'm a beginner as well, and I use a nikon d40. It is the one of the cheapest DSLRs so you'll have plenty of leftover money to buy accessories such as lenses and a flash and tripods etc. While the d40 is the cheapest dslr, it is not bad, and is very easy to use. It has a big bright accurate back screen which is nice so you can view your pictures, check the exposure and histogram, make changes and then retake the picture. Also since you're a beginner you probably won't need the very advanced features of oher cameras. (Also btw, megapixels barely mean anything, the quality is all about the sensor and the lens and this camera has a good sensor.) With this camera you can set exposure manually, automatically, apeture priority or shuter speed priority. You can set the iso from 200 to 1600. Also it has a bunch of auto shooting modes (though you'll usually want to shoot in manual) It is very easy to use and has many other features. Also a great general shooting lens is a nikkor 18-70mm f/3.5-4.5 afs lens (with autofocus and a manual focus ring if you ever need it. Also a great lens is a 50mm prime f/1.8 nikkor, except that doesn't have autofocus or zoom. I;ve had this for 2 months and am not at all dissapointed, you don't need a nicer camera, and they're bigger and heavier (not that this is small). Good luck

Could it be 'Chromatic aberration'? A fault that is caused by poor lens design or the use of inferior materials. You can see the effect with simple magnifying glasses when you look towards the edge of the lens and will observe either a red or a blue fringe around images.

1