There are many camera manufacturers in the digital imaging market globally and most of you may know two of the major manufacturers are Canon and Nikon. Whichever the manufacturer they are, they have a wide range of cameras cater for people in any levels. It usually divides their market by differentiating the camera sensor size, for example, entry-level cameras are advanced photo system type-C (APS-C) sensor and professional cameras are usually full frame format and may go up to medium format camera.
With many types of sensors in the market, camera manufacturers market their cameras by focusing of the number of pixels, their individual microchip processor and the size of the LCD screen of their cameras. But how many pixels you actually need? If you print 4R photos (4 x 6”) regularly, take 300ppi (pixel per inch) into consideration, you will only need 1200 x 1800 pixels. Which takes only 2.16mp megapixels to print a 4R photo. An entry-level camera with 18mp is way more than enough to print a regular 4R photo. Therefore, don’t get mixed up by looking into the megapixels when buying a new camera. Yes, more megapixel may have more room for you to crop your image but it also means that more storage is required for the larger file size. So, compose your photos in camera by walking towards or away from your subject and you will still be able to capture high quality images without high megapixels camera.
Not doubt that the larger the sensor, the better the camera performs in terms of bokeh (out of focus). For example, bokeh effect can be achieved easier and more pleasing to the overall image for larger sensor compared to a small sensor. However, smaller sensor can also create bokeh by zooming in your lens and focus closer to the camera. The bokeh effect achieved is very similar to a larger sensor camera.
Does camera sensor size really matter? Yes, when capturing images in low light situations or managing huge prints. Larger sensors are capable of capturing more lights and handles ISO more better compared to a smaller sensor. Therefore, when printing large prints, it is ideal to use a larger sensor camera.