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You know, there are many tutorials in youtube:

 

https://www.youtube.com/results?search_query=canon+t3i+tutorial&page=&utm_source=opensearch

 

 

Sadly i don't own that camera so i can't help you but in areas with good lightning you need a low exposure time and in dark areas you need a longer time.

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Here's a link to a well laid out guide on the exposure triangle, which in my opinion is probably the best place to start learning if you plan to shoot in manual mode. http://www.exposureguide.com/exposure.htm

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A DSLR in manual mode works like this. You have Shutterspeed, Aperture and ISO. If your pictures are too dark you have different choices.

 

1. stop down the shutterspeed: This works only if you put it to a shutterspeed where you can still handhold it without blur coming up (about a 60th of a second)

2. bump up the ISO: This works only if your picture doesn't get to noisy (maximum is 3200 ISO on the t3i but i would only go to 1600)

3. Increase the aperture: The lower the lower the number is the brighter it gets. f/1.8 is a bright setting (Maybe your lens doesn't have it) and f/20 is a setting that needs a higher shutterspeed. The lower the number is the more blurry is the background and with a high number it seems like everything is in focus. Because a high number means the aperture blades make a smaller hole and don't let that much light in. And a low number opens up the aperture blades and lets more light in.

 

I would say you shoot in Av mode and always watch the screen on what changes the camera makes. Then you can also take a look at Tv mode and do the same. And when you did this you can try to use manual mode.

 

Watch some youtube videos. They teach it in an easy way.

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