Hi Dottore,
I would much appreciate if you could inform us how you know this is the way they manufacture an 8,000 dollar professional camera.
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By reading e.g. patents in the area you learn that there are "pasive" and "active" methods, where active methods are those where actual alignment is made. Pasive methods use various smart tricks with holes, rods, markers, etc. to assembly the widget, but no check is made.
The text below is about sensor tilt, not angular misalignment. But it is quite clear that "pasive methods" are very attractive to the manufacturer.
"For high cost/low volume cameras, the CCD is "actively aligned" to the lens. This means that each individual camera is adjusted to eliminate this tilt. Currently, this is a very expensive and time-consuming process which is impractical when manufacturing low cost/high volume cameras. Consequently, most lower cost digital cameras do not actively align the CCD. Instead, they typically mount the CCD to a very flat plate (with screws) and then mount the plate to the lens assembly. By controlling the flatness of the plate and CCD package, and the perpendicularity of the lens mount to the optical centerline, the resulting tilt can often be controlled to an acceptable degree. However, not only does the CCD plate adds cost and assembly time, but it still results in greater variation of lens/CCD tilt than can be tolerated in certain applications. "
So it is, I believie, with angular alignment. it "can often be controlled to an acceptable degree". Enough said.
There definitely is a qulity control after the camera is assembled. A controller can see with naked eyes that the alignment is say, 2 degrees off, but he passes such a piece, until it is , say 5 degrees off. After the camera is assembled adjusting would cost as much as a repair, and most people will never send it for repair.