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Thread: What is total track length?

  1. #1
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    What is total track length?

    Hi,
    Can anyone tell me what is the definition of total track length (TTL), and what does it actually afect.

  2. #2
    Manuf. Lens Surface Treatments
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    Redhot Jumper track..................

    Quote Originally Posted by udilevy View Post
    Hi,
    Can anyone tell me what is the definition of total track length (TTL), and what does it actually afect.

    Please clarify the track:

    Sports track

    Railway track

    Fezz's beer track

    :hammer:

  3. #3
    Bad address email on file Dougfir8's Avatar
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    A google search discovered that term is used in determining the use of lenses in copiers: "Accordingly, the total track length between the object and the image is 72.689 mm. The optical transfer function for this lens was calculated based on a best focus of λ=546 nanometers and an optical contrast of eight lines per millimeter."
    I have no idea how it affects eyeglasses!

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