Grain scope

Discussion in 'The Darkroom' started by nealjpage, Mar 8, 2008.

  1. nealjpage

    nealjpage multi format master in a film geek package

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    Silly question, but how does a grain scope help in focusing an enlargement? The mirror surface is a few inches off the paper--wouldn't measuring from that height affect the focus on the paper itself?
     
  2. doobs

    doobs TPF Noob!

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    That's a good point. Never thought about that. I always get correctly focused prints when using it. So, no worries. :/

    I bet it's some special kind of mirror in the reflecting mirror or something.
     
  3. Hertz van Rental

    Hertz van Rental TPF Noob!

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    You view the reflected image through a lens eyepiece which magnifies the image and makes it suitable for viewing. This lens changes the point of focus for the enlarger image and the distance the mirror is from the paper compensates for this ;)
     
  4. Helen B

    Helen B TPF Noob!

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    The distance from any point on the mirror to the paper surface exactly equals the distance from that point on the mirror to the plane the eyepiece is focused on (ie the reticle or small ground glass, depending on the type).

    Best,
    Helen
     
  5. Early

    Early TPF Noob!

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    A good one will enlarge the grain to help give you pin point focus.
     
  6. nealjpage

    nealjpage multi format master in a film geek package

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    Thanks! I figured that there must be some sort of compensation thing. Now I know for sure.
     

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