Just a little bit more information about megapixels. Some years ago I was looking for a professional camera for some professional activity and in those days a leading Nikon camera had a sensor at four megapixel. It was competing with cameras producing six megapixels and even eight megapixels. In those days I read lots and I got the idea that more megapixels was actually better. After I had purchased a six megapixel camera I got the opportunity to look at some prints that have been taken with the four megapixel Nikon. The prints were produced life-size and showed the face of a man who had posed in good lighting. The four megapixel image was remarkable in detail and accuracy. The print was then increased in size to twice life-size and printed again. There was no noticeable degradation in quality.
Megapixels equals size of the image. The more megapixels the larger the image.
Today we see lots of cameras above 24 megapixels. People are talking in 40s and 50s and 60s and even 100 megapixels. We have printed posters 2 m long taking a crop from a 16 megapixel image and therefore using approximately 10 megapixels worth of information. The posters have sold and have been praised for their remarkable detail and quality. When you buy into larger megapixels you are buying a lot of real estate that you will crop into in many instances. Most photographers will crop their images to suit the application. So extra megapixels just gives you a larger image so that you can crop out of that in post-processing if needs be.
With a 20 megapixel image we can easily print huge images
Large images and large megapixels cannot be discounted for some purposes but the average photographer who doesn’t want to print above a A1 poster size will find that 20 to 24 megapixels is huge. We currently have in our stable 2 46 megapixel cameras and they produce very large files indeed. The focusing on one of them is so accurate that we are able to track birds easily in flight and get super sharp images. The bird occupies approximately 1/10 of the final image and is cropped out of that so that we are shooting at 46 megapixel but keeping around four megapixel for the final image. When I shoot landscapes with a large megapixel camera and compare the image from the large camera to the smaller camera at 20 megapixels we can find no difference except if we zoom into pixel size on the screen which is way beyond any realistic viewing of any image.
For a wedding, shooting between 16-24 megapixels will give you speed and plenty of quality for everything from large framed photos to albums and more.
If you shoot a wedding with cameras rated at between 16 and 24 megapixels you will find that you have plenty of information to produce the perfect wedding album. But then it’s all about technique and not about megapixels. Far better to have really good lenses and good flash synchronization in order to make the best of the various situations that you face as a photographer than to have a larger megapixel camera.