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  1. #1
    Junior Member
    Join Date
    Aug 2004

    Formula: Lens + Ring

    Hello all,

    I recently bought a nikkor 300 f2.8 mf. By means of a ring, I'd like to reduce the minimal focus distance. Is there some kind of formula to calcuate what the effect of a certain ring is on the focus distance?

    All advice is welcome!



  2. #2
    Join Date
    Mar 2004
    Buenos Aires, Argentina

    Re: Formula: Lens + Ring

    I know the minimal focus distance can be calculated when using extension rings, but don't remember the exact formula. Try a google search of +"extension ring" +"focusing distance", or similar. I sure you will get some useful data.

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