Exposures with hdr

ok, so i think i know the basics of creating an hdr image from different shots at different exposures on my computer, but while I was looking at a tutorial to actually shoot the images, it said to do bracketing at exposures of -2, 0, +2, but I have no clue how to do that. I know it has something to do with the exposure, but I just dont know how to adjust the exposre to be -2, 0, and +2. does say for example -2 mean i shoot the scene 2 stops down? which would mean decreasing the f number right? i dont really know, ..help

well most cam's if you hold down the exposure button which has a +/- sign on it hold it down and turn a dail to change your exposure of -2 0+2.

Here's a good tutorial.............
mansurovs.com/hdr-photography-tutorial

Thank you for the tutorial

I just took a look at it; the HDR Tutorial is excellent. I've added it to my list of Key HDR Bookmarks. I'd like to add a couple of additional points. (1) Keep in mind the distinction between AEB (auto exposure bracketing) and exposure compensation. I tend to set my exposure compensation at +0.3 for all the photos I take--both HDR and non-HDR. With this setting for exposure compensation, when I set my AEB to three photos at 2EV steps (2 stops) of -2, 0 and +2, the actual settings on my camera are -1 and 2/3 (-1.667), +0.3, and +2 and 1/3 (+2.333). Secondly, I always shoot my HDR photos from a tripod and use aperture priority. Hence, the difference between the three exposures (i. e., normal, under-exposure, over-exposure) is the shutter speed. When you use a remote control shutter release, you can actually hear the difference in the time the shutter is open. As Trey Ratcliff put it in his book, A World in HDR, think of light as the third dimension adding depth to a two-dimensional photo. To put it another way, by varying the shutter speed, you are varying the light. Finally, when shooting HDR, after you focus your image (assuming you use auto-focus), slide your auto-focus dial to the Manual position to eliminate the camera searching for the focus on the different exposures. And, set your camera to the Continous shot mode instead of the individual shot mode.

Once you reach this point, you should be getting pretty good HDR photos. For 95% of my HDR photos, three shots is sufficient. There are, however, some scenes/situations where five and possibly seven photos are required. Use your histogram to tell you when you need additional photos. By the way, all DSLRs do not automatically have AEB settings of -2, 0, +2. Some only allow 1EV settings (-1, 0, +1). But, this is a subject for another day.