This is curious, as I have been unable to manual-focus any 28, 24, or 20mm lens manually at long-to-infinity range, and that's using older cameras (KX, MX, SuperProgram. I just stop down and use hyperfocus at an estimated distance. Anyone else have this problem?
A magnifier can greatly solve this problem. However, I would not assume all cameras must focus at infinity just like the lenses shown. What I have found is that many used Pentax cameras focus "past" infinity because of the missing washers between the front cast and the main body (typical Pentax manual focus camera design). This is due to inexperience repair job. So, for instance, with a 24mm lens, the actual film plane might hit infinity when the lens shows 3m (because the film plane to lens distance is shorter than the specification). And what's even more susprising is that my 3+ years old Z-1p which was purchased brand new and has never been serviced, also suffers from this problem. So I cannot rely on the focus scale alone for hyperfocal, I must focus first. However, the focus screen & AF were calibrated according to the actual film plane focus so there is no AF or MF error. Perhaps you guys could try to use your widest lens and see if they focus past infinity (ther reason I suggest widest lenses because they are more likely to show the error).
Alan Chan http://www.pbase.com/wlachan
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