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How to hold a camera
Use your left hand to support the weight of the camera completely on your palm. Use Thumb and index finger to curl up around the lens. Make sure that your elbow rests firmly against your chest. Your elbow must stick to your body and not extend out while supporting the helps to avoid camera shake and blurry pictures.
Use your right hand (primary hand) to hold the camera grip, operate dials (shutter and aperture) and other buttons. Use your thumb to press the shutter.
All DSLRs are designed keeping right handed people in mind and it becomes extremely cumbersome to use these cameras for the left handed people or southpaws. But Canon recognized this problem and launched Canon EOS 7D L.
Everyone often wonders about the camera mode dial and I have frequently been asked by new camera users that which is the best mode and the answer is whichever one can click the image that you want to click the quickest.
Some people say that professionals always use manual mode. However, it may not always be the best idea. camera mode dial is divided into 3 parts – (Full Manual, Semi manual), (Auto, flash off auto), preprogrammed (landscape, portrait, action, etc.).
Full manual mode lets the photographer select ISO, aperture and shutter speed independently. Semi manual mode lets you select either shutter speed (S mode) or Aperture (A mode) and selects the other parameter for you at a given ISO. Now a days in modern DSLR cameras Auto ISO feature is also present where you can limit the range of Auto ISO and define minimum shutter speed. If you do this, in Aperture priority mode camera will vary the shutter speed up to the minimum shutter speed defined and then will vary the ISO if required.
These semi manual modes (A & S modes) are very useful for street photography, journalism, etc. because capturing the right moment is very important in these genres. The decisive moment, if lost, may never come back again.
Program mode (P mode) is like auto and gives you the right settings but you can change the recommended settings if you wish to.
Preprogrammed modes are not very useful if you are trying to be a serious amateur/professional photographer however, these are fun to mess around with.
While using semi auto modes you may not want a well exposed scene and you might want to overexpose or underexpose depending on your personal creative call. To accomplish this there is option to tell the camera to underexpose/overexpose by a half stop or 1 full stop or more.