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That's not correct
In reply to Sante Patate,
6 months ago
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Sante Patate wrote:
westerner wrote:
I came across a post here where someone adjusted a hex screw inside the mirror box to tune the distance between the mirror and the sensor, so I tried it out. Long story short, it worked, and my camera has been flawless ever since, with every lens I own (Nikon 24-70 f2.8, 70-200 f2.8 VRII, 50 f1.8G, 18-105 VR, Tokina 11-16 f2.8, Sigma 17-70 f2.8-4 OS, and Tamron 70-300 VC). I have turned AF fine-tune off, and no longer need any fine-tune with any lens. I even borrowed a 18-200 VRII and a 55-300 VR, and both of those were dead-on accurate.
No. The hex screw does not "tune the distance between the mirror and the sensor". How could it? The mirror is translucent where the light goes to the AF sensors so the mirror angle is irrelevant. The hex screw adjusts the angle of the mirror so that the little boxes in the viewfinder are more accurately matched to the location of the AF sensors.
That's not correct. The AF adjustment screw does in fact change the angle of the translucent window which also changes the angle of the AF sub-mirror (hinged behind main mirror) and does indeed affect PDAF focus. It is actually one of the things Nikon service does when they recalibrate the body.
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