What is a mirror lens exactly? And have they got a new lease of life when used on mirrorless cameras? I've been trying them ...

Today I'm comparing the Nikon Z 28-400mm f4-8 VR to the Nikon Z 24-200mm f4-6.3 VR. Both are great lenses with different features and some crucial differences that separate them from each other.

The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with in-camera corrections switched off, as far as we can know anyway. CA is well controlled ...