>>3904830>Some manufacturers are even smart enough to continue to include the feature because of this.There's only Nikon (the last to enter mirrorless market) and Olympus (only available on certain telephoto lenses), and I think that Sony used is on some early apsc bodies. It's 100% a legacy feature. It's not needed at all on mirrorless cameras. I suppose that there is a niche use for it, of intentionally misaligning af sensor to account for desired focus, but that's all I can think of.
You don't know even know what microadjustments are used for, or how they differ from dslr to mirrorless. On dslr, af sensor is not present on image sensor itself, on mirrorless it is, so it's as perfect as it can be.
Say, you're shooting a wall that's exactly 1000mm away from the camera. Slightly misaligned lens on dslr will act like this:
Camera will detect the distance from wall to AF sensor precisely at 1000mm. Then you will press shutter button, shutter will flip up and expose image sensor, but since light's path from the wall to the sensor is slightly different than what it expects, it'll miss focus by 10mm, and focus at 990mm. This will happen always. In 100 attempts it'll always miss focus by 10mm. Corrected with microadjustment settings, this will be negated and camera will always focus at 1000mm.
On mirrorless, light goes directly to the sensor. Af sensor on the mirrorless body doesn't even need to know how far the subject is. It can see it live, therefore it can account for every discrepancy on the way, and nail focus. Even in cases of severely misaligned lens, the sensor will be able to correct it, and at least put part of the image in focus. Now, here is the disadvantage of mirrorless. It is slower, and less accurate, and consumes more power. In 100 attempts, it may miss focus few times. You are talking about those cases. Missed focus from misaligned lens and missed focus from af inaccuracy are different things. Only the former can be fixed by microadjustments.
