Focusing ring adjustment

 Because the infinity position of Minolta MD 35~105 Zoom was under adjusted, the inconvenience was corrected by rotating helicoid angle a bit as to come over infinity at 105mm telephoto zoom position. In order to perform this adjustment, 3 hidden small minus screws should be loosened and re-tightened hidden under the rubber ring. Any disassembling procedure is required to do this work if lens cleaning is not necessary, just removing rubber ring and resetting permission. Consulting in the Web sites about the infinity position ill-setting, not a few report was observed, most of them are thrown away as it is, no focusing at infinity. 

Deeper consideration checking it construction, such kind of inconvenience might occur only when it was not well adjusted at the role out from the manufacturing factory of Minolta. Depletion of rublicant on the moving part and sliding part is not reason for the problem. This is nothing but a misadjustment on the manufacturing line, misunderstandings of the engineer caused this problem. Poor QC control was the reason.

The infinity helicoid ring position must be adjusted when the longest view angle conditioned position because the infinity focusing angular position displaces when zooming action is applied. Strictly speaking following the definition of Zoom Lens, infinity position should not be changed at any zooming action. If moves due to view angular differences, it is called as Variable Focal Length lens.

So, Minolta MD Zoom 35~105 should be named as MD Variable Rokkor. Because I'm not a claimer at all, no claim on this point. Consequently, the inconvenience that has been lasting for long time and causing unexplainable bad feeling on this Zoom lens was completely wiped out. The focusing ring at the infinity position should be adjusted as slightly over infinity is a common sense at all no matter how it is wide angle or telephoto.