1. P is not for professional. So you pick up your camera, switch the mode dial to P, or if you are really getting fancy perhaps even shutter speed or aperture priority. But how do you go shooting in manual mode? Are you on top of all the decisions you are faced with? Leaving your camera on manual for a while may feel awkward at first but after a short period you will gain a much better understanding of aperture, shutter speed and ISO and how the three correlate to determine exposure. After you are comfortable shooting in manual there will be situations in which you still shoot aperture or shutter priority however you will be better informed to select the right mode for the situation and to evaluate the decisions you are putting into your cameras hands.
2. The lower your ISO the cleaner your images. Digital photographs contain artifacts known as "Noise". The higher you set your ISO the more noise your images will exhibit. Thus always use the lowest ISO you can, just don't forget to be mindful of your aperture and shutter speed and make sure they are correct for the situation at hand.
3. Understand shutter speeds and how to use them to your benefit. The general rule for hand held photography in order to maintain sharp images free of camera shake is that you should use a shutter speed no slower that 1/focal length. Fop example lets say you are shooting with a 50mm lens, the slowest shutter speed recommended for sharp hand help photos would be 1/50th sec, if you were to use a 250mm lens the slowest recommended hand held shutter speed would be 1/250th sec. There are of course exceptions to this rule, you may be able to get away with slower shutter speeds if using a flash. Another option is to use a tripod which is a great idea in general as it leads to more purposeful and thought out images.
4. Make the most of depth of field. If you don't already understand aperture and it's effect on depth of field do some research and learn it. Used creatively and with purpose DOF can transform average photos into great photos. Try shooting some portraits with a shallow DOF in order to render the focus on the subject and remove the distraction of messy backgrounds. An easy way to remember it is that the smaller the f stop (e.g. f 1.8) the smaller the DOF, the larger the f stop (e.g. f16) the larger the DOF.
5. Understand fill flash and when and how to use it. On camera flash can look flat and unflattering however used as fill with the flash power set to approx 1 stop under ambient you will be able to open up the shadows and obtain portraits under full harsh sunlight whilst avoiding the heavy shadows in the eyes. This will lead to more professional looking portraits with greater detail and more flattering light.
By understanding a few simple principles and techniques you can push your photography forward in leaps and bounds. Now get shooting!
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