Mean of numbers 7, 8, 11 on Nikon 28mm PC

[hotduckz]

<p>Who know mean of it?<br>

I don't know about it, please.</p>

<p>Thank you.</p>

[leicaglow]

<p>It's been awhile since I owned one, but I believe it is the amount of off-center axis in mm. I wish I hadn't sold mine<g>.</p>

[lex_jenkins]

<p>Nikon terms it a "Maximum Permissible Shift" value indicator. As the front elements section is rotated the maximum shift without unacceptable distortion changes. The 7mm, 8mm and 11mm markers are handy references for this.<p>

I'll try to find an illustration later, but the numbers - 7, 8, 11 - correspond with the shift scale white lines on the side of the shift knob. On my copy of the 28/3.5 PC Nikkor there are 11 white lines, making it relatively easy to determine by eye the MPS.<p>

 

 

Keep in mind this isn't a physical limit that prevents users from exceeding those limits, only a guideline to assist the user.<p>

 

The suggested MPS with a vertical "shift" (technically, rise/fall) with a camera in horizontal/landscape orientation is 11. In the same orientation, the MPS for a side to side shift is 8. Off axis rotations will have an MPS of 7 or 8. The instruction booklet includes graphs to help illustrate this.