Sunday, November 21, 2010

Collolary: 135mm Ai-S (Modified)MFD

Because the whole optics moves to focus, and everything is managed by those helicoids with such an easy fine tune mechanism, just a Scotch tape, one can modify the minimum focus distance stop, without losing the ability to focus to infinity.

Because my interest in regards to this lens is in portraits, I've modified it, and now is capable of focusing at around 1m, much closer than you can get for example with the 70-200 II.


  1. Hi Miguel,

    What did you do to get this lens to focus closer? In doing this did you lose infinity focus?

  2. No, you do not need to lose infinity focus. There is an aluminum ring that sets the rotation limits. File the stop that limits the close focus, and it will turn more. Don't give it so much rotation angle that the block will dismount, though.