Fine-tune AF
Improves: Sharpness Use in-camera lens micro adjustments to improve the sharpness of older lenses
Even shooting with the best DSLR sensor, featuring the most megapixels, may not deliver crisp results if the gear is not checked over time. One issue that is often not addressed is the accuracy of your camera’s autofocus, which suffers as it shifts in the optimal focus position of the lens elements over time. The precision of the AF is then either slightly shifted forward or backwards towards the subject.