Canon 550D basic operation: Beginners guide to the mode dial 

Let me just explain in short 😂 Aperture is just a window thingy that lets the outside light in. The higher the aperture is, the darker your image is. Also higher aperture will reduce the depth of field, which can be good for portrait photography. Shutter speed is just the speed that you camera make the click sound. Fast shutter speed will make the image clearer, but you can only do this under some bright place bc fast shutter in dark place will creates many noise. Most of the time the slow apertures are use for special light effect, you ca search it in RU-vid if you're interested. IOS is the your camera system's brightness. Pretty useless bc I always set the exposure by the clicking and changin with the exposure button

Glad it helped!

Because the lens you are using will only go down that low. If its a zoom lens, then it will have a variable lower aperture depending how much you zoom in. At 18mm the aperture will go to f/3.5 for example. If you zoom out to 55mm, the lowest aperture will change to f/5.6 or something similar. More expensive lenses have fixed apertures, meaning they can stay at their maximum aperture throughout the zoom range.

Mireya Lopez lmao

It's the viewfinder yeah. It's an optical image directly from the lens, not a digital one so any changes to settings have no impact on it.

@@TomPhotoix tysm for replying so quickly

It may also increase the ISO but it will mainly pick a slower shutter speed to let more light in. It probably has a built in limit in which it will hit a certain shutter speed and not go slower than that, then start increasing the ISO.

You can’t, it’s a fixed 50mm lens. All you can do is crop the photo in a photo editing software.

Press the live view button beside the viewfinder with the red dot next to it.

+BagelsO I have several videos explaining them both. Search my channel.