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Digital resolution is quite a complex system and involves a fair bit of mathematical thought if you want to decide exactly how much is suitable for your needs. There are plenty of rough guides around and the following offers the simple and more complex response to this question.
In a simplistic way, the resolution you need will depend on the size of your prints. Digital SLR cameras on the market today all have suitable levels for regular prints, and lower quality publication. If you intend to take your shots and print them at around 8×10 or less, then you won’t have any problems no matter what you look at in the SLR market.
When you begin to look at glossy, high end photo printing or larger format printing, from around 16×20 and over, you’re going to need a minimum of 8MP to get a quality image that isn’t distorted or full of noise and pixilation. If you intend to focus on a more artistic photography style, then go for the highest available resolutions to get stunning results.
The complicated answer is thus, and is fairly mathematical. Working from the average 8×10 print, there is a formula you can follow to get your answers. Know the pixels per inch levels of the printer that will be used.
The higher this is, the better quality your images and more resolution you’ll need. Multiply this pixel amount by your measurements and you’ll find out the vertical and horizontal dimension requirements. From here, you simply multiply these answers together to get your megapixel level.
Using a 240dpi printer, you’ll end up with 4,608,000 pixels which is equivalent to 4.6MP. Then allow for some changes and editing and you might find that the ideal resolution for your needs when working in 8×10 photographs is roughly 6MP. This is just a guide and it’s best to look at your personal needs and equipment, your printer will make a major difference here.
Overall for normal sized prints you’ll find any digital SLR will meet your needs and you can look for higher resolutions if required, otherwise it’s generally a bit of a wasted feature.
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