Keystone effect
Wide-angle primes and zooms are the lenses W to reach for when you want to squeeze large subjects into a single picture and you’re not able to – or don’t want to – shoot from further away. One thing to be aware of when shooting at close distances is converging verticals, where the subject appears to get narrower at the top. This type of distortion, also known as the keystone effect, can happen if you tilt the camera upwards to fit in the subject. It’s particularly noticeable when you’re photographing buildings and other man-made objects with straight lines, with the structure appearing to be leaning backwards in the image.