If you are on the market for a new digital camera then there is a good chance that you are asking yourself that exact question. Maybe the number of megapixels that you are considering is different. Do you really need a 16MP digital camera? 8MP? 6MP? This article tries to help you answering this question. New digital camera models that are put on the market support more and more megapixels. This race for more megapixels is in part driven by manufacturers who want you to buy their newest and greatest digital camera and the easiest way for them to make you compare cameras is by using one simple number ? megapixels ? the higher the better or at least this is what they want you to think. But reality is different. When it comes to megapixels more is not necessarily better. Since most of us have a limited budget that we are willing to spend on a digital camera spending more money to get more megapixels means spending less on other features or accessories ? such as storage and lenses. The overall quality of your photography experience is dependent on such extra features. When deciding on the number of megapixels that you need you should first consider what your expected usage is. You need more megapixels if you plan to print photos (especially big enlargements) or if you need to zoom in and grab fine details out of big digital photos. On the other hand ? you do not need much if you plan to watch your digital photos on your computer screen and occasionally print a few 4X6 prints. In fact 2 megapixels are more than enough for such usage. Consider your computer screen resolution which is in most cases 1024X768 - even when viewing your digital photos in full screen mode you are only really watching 1024X768 < 1 megapixels. A 2 megapixels 4X6 photo print has a DPI higher than 300 which is more than enough for a good quality print. If you plan to print enlargements consider the following table for the recommended number of megapixels for different print sizes (based on print quality of about 300 DPI): page 4X6 2MP page 5X7 3MP page 8X10 7MP page 11X14 14MP page 16X20 28MP page 20X30 54MP When considering spending more of your digital camera budget on getting more megapixels you should ask yourself questions like: should I instead get better lenses? Should I instead get an external flash unit? Should I instead get extra storage media? Don't be a victim of the megapixels race. In many ways the race for more megapixels is similar to the race for more megahertz on personal computers. In early days when computers speeds were slow ? more megahertz was important. Today though ? having a 4Ghz or 5Ghz computer does not make a difference and you are better off spending more money on more memory than more megahertz. The same is true with megapixels ? in early digital cameras days the number of megapixels was low and it was important to get more. Today with most cameras having a high number of megapixels it is probably wiser to get better lenses or more storage than upgrading from 8MP to 10MP.
Everybody knows to check how many mega pixels their new camera has. Although more mega pixels does not necessarily mean better photos most people understand why mega pixels are important. One characteristic of digital cameras that many ignore is the sensor size. Digital cameras capture digital photos. A digital photo is a collection of pixels. Each pixel has its color and intensity. When all these pixels are put together the result is an illusion of a photo. Pixels are captured by the camera using an electronic sensor known as a CCD. The CCD sensor is a silicon chip that is built of many tiny light sensors. When taking a photo each such tiny sensor measures the amount of light also known as intensity and some other attributes such as the color. Each such sensor results in one pixel and all the tiny sensors put together represent one digital photon. This is very interesting to know ? but why should you care? The reason is that there is a relationship between the size of that CCD sensor and the number of mega pixels that it supports. This relationship is important and has practical consequences. It is intuitive that for the same CCD sensor size, the more mega pixels the smaller each CCD tiny sensor is. The same is true if the number of mega pixels is fixed: the bigger the CCD sensor the bigger each tiny sensor is. For each CCD sensor size and number of mega pixel we can calculate the pixel sensor size. The pixel sensor size is important and influences the characteristic of the digital camera especially in marginal light scenarios. Your digital camera sensitivity to light is directly influenced by the pixel sensor size. The bigger the sensor size the more light it can accumulate in a certain period of time. The result is that bigger pixel sensor sizes allow for faster shutter speeds at lower light conditions. In addition bigger pixel sensor sizes result in less noise captured by each such sensor. In practical terms if you take two digital cameras with the same number of mega pixels but different CCD sensor sizes - the camera with the larger CCD sensor size will be provide digital photos that are sharper and have less noise. It will also be able to take digital photos in scenes that are too dark for the other camera. In normal light scenes the higher light sensitivity allows more range for changing the aperture and shutter speed and more freedom with getting different focus depths. Bigger CCD sensors are more expensive. There are many reasons for that one of them is the lower manufacturing yield. For that reason cheaper pocket cameras use smaller sensors than high end digital SLR cameras. CCD sensor size also influences other optical attributes of the camera ? for example the aperture needed in a specific scene changes as the CCD size changes. The depth of field is directly influenced by such aperture changes. To normalize optical figures many cameras manufacturers choose to normalize their optical attributes to the good old 35mm film (film can be seen as a sensor too, 35mm in size).
Ziv Haparnas has sinced written about articles on various topics from Digital Camera, Digital Photos and Digital Camera. This article can be published only if the resource box including the backlink is included. Mr. Haparnas writes about technology and digital photography. Information about photography and photo prints is on printrates.com - your home for. Ziv Haparnas's top article generates over 74000 views. to your Favourites.