There are few questions that get the most interest. So, how many megapixels do all four corners have? For the cameras that focus on the 4K end of the frame, there’s a fairly simple formula.
When using a lens with larger apertures (focal lengths above f/8) the corners are sharpest. For small apertures (apertures below f/8), the corners only get sharper with increasing the lens aperture. In fact, for lenses with a minimum aperture of f/8, the corners are the sharpest when using a medium aperture lens. For most lenses, the corners get sharper when they’re stopped down even further as the focal length gets smaller and smaller. A small aperture gives the camera a wide angle view for both center and edge but when you reach the full 4K range, the corners start to get increasingly pixelated.
We’ll discuss these issues in more detail in a future article, but to sum up, using large apertures, particularly larger apertures (f/1.8 and above) gives us the best resolution and sharpness for the corners, with smaller apertures providing just as good picture quality and sharpness at a small price.
When you’re shooting at full 4K, don’t worry about apertures. The sharpest corners will continue to be found when shooting at the highest pixel density.
Here are two examples. You might use the two samples in this article as a reference.
Focal Length of aperture 4K 0.8 1.8 Full 4K 1.3 1.3 High 4K 1.0 1.0 Low 4K 0.7 0.7
A couple of notes before getting to those images, which are both of my own work. These were shot at 0.8, but the apertures were 1.8 and 1.6, so their corners are much better than when I shot them at 1.6. I only shot those at 4K because I don’t have a 4K camera that is suitable to shoot at full resolution, so those were the only samples I could use before I upgraded my camera. The images used three different lenses, so you can guess what the sharpness is like from that lens, whether the corners are getting sharper (as they should be) due to my sample photos (which were shot at 0.7) or not.
The first image is an example taken with a medium
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