Released in 1981, the Canon AE-1 Program is an updated version of Canon's famously popular AE-1 camera from 1976. The AE-1 Program has the same classic Canon design and capabilities as the original AE-1 but with some nice extra features. .

All EOS camera models, film and digital, have a button on the back of the camera that's marked with an asterisk or star icon. This is the AE Lock button. Auto Exposure Lock (sometimes called AEL) is a feature on all Canon EOS camera models, as well as some PowerShot cameras.

It’s an excellent method of gaining added control over exposure, without losing the speed and convenience of automation. In fact, since most photographers today use some form of auto exposure the majority of the time, an understanding of how AE Lock operates can add a new dimension to their photography. Photographers experimenting with the EOS 5D Mark II Movie Mode may find it necessary to master the use of AE Lock, as this function offers something close to manual control over the exposure during filming (you can read about Vincent Laforet's experience with AE Lock on the EOS 5D Mark II during the production of his short video Reverie.) What is AE Lock? What AE Lock does is simple: It “freezes” the camera’s exposure settings, so that if the camera is moved from one area to another, the auto exposure system won’t change aperture/shutter speed values. There are many situations where this may be useful.

A photographer shooting a portrait, for example, might want to place the subject off-center. Taking a meter reading off the subject, locking it (along with focus), and then moving the camera to re-compose the subject means that. Another example might be a shooter taking a sequence of images, panning the camera from one area to another (following a moving subject, for example). Canon Eos 350d Driver For Windows 8. If there are differences in the background or lighting, it’s possible that exposures will vary from one shot to the next.

With AE Lock active, exposures would be consistent from shot to shot. Evaluative metering and One-shot AF mode: Many EOS shooters already use Auto Exposure Lock and don’t even realize it. All EOS models (to date) automatically lock exposure when you’re using Evaluative metering and One-Shot AF mode. Press the shutter button half-way down, and the exposure settings will be locked in-place with no further effort on the photographer’s part. If you keep partial pressure on the shutter button, you’ll see as you move the camera side-to-side that the shutter speed/aperture numbers don’t change. Pull your finger off the button, and the camera immediately begins to update exposure settings as the camera is moved. Free Download Epson M188d Printer Driver more.

However, this only happens when you combine One-Shot AF mode with the Evaluative metering. Switch to AI Servo AF, and/or use any other type of metering, and exposure always continually updates itself as you move the camera.

The AE Lock button: All EOS camera models, film and digital,. This is the AE Lock button.

Pressing it when you’re in any “creative zone” auto exposure mode — P, Av, Tv, or A-DEP — will immediately lock exposure in-place, and to advise you of this. So the procedure is pretty simple: Aim the camera at the part of the subject or scene that’s most important to meter accurately. Press the shutter button half-way to start metering, and then press the rear AE Lock button. The asterisk will appear in the finder, so you know exposure won’t shift as you move the camera to re-compose the shot. You do need to keep pressing the shutter button half-way to keep the meter active (and locked); if you were to pull your finger totally off the shutter button, the camera would turn the meter off in about 4 to 6 seconds, and at that point you’d lose the reading you just locked-in. As mentioned above, it’s not necessary to do this if you’re in One-Shot AF with Evaluative metering; just pressing the shutter button half-way will freeze exposure. But all other AF or metering modes require you to press the AE Lock button if you want to lock exposure.