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Thread: Filters/Tints questions

  1. #1
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    Filters/Tints questions

    Guys, any chance on some homework help?

    What Filters or combination of filters would be suitable for the following?
    Target Shooting in hazy weather
    Skiing at high altitude
    Arc Welding
    For an extremly light senstive albino child
    For a dyslexic child

    Also,
    how can you tel if a tint is solid or coated on a glass lens?
    How does temperate effect photochromic glass?
    When is a neutral density tint useful?

    Cheers guys, my books just arent giving any clear answers

  2. #2
    Underemployed Genius Jacqui's Avatar
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    Most target shooters that I've met used yellow tint.

    At one time it was thought dislexia responded to a violet tint, however one of our members has done exhaustive studies of this and says it is not permanent

    A colour coating on glass looks a lot like AR coating.

    The colder the air temp the darker photogrey gets.

    That's all I can answer right now.

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    Quote Originally Posted by Jacqui View Post
    Most target shooters that I've met used yellow tint.

    At one time it was thought dislexia responded to a violet tint, however one of our members has done exhaustive studies of this and says it is not permanent

    A colour coating on glass looks a lot like AR coating.

    The colder the air temp the darker photogrey gets.

    That's all I can answer right now.
    cheers, yeah i had oranage down as target shooters but wasnt sure,
    the dyslexia i had down as a yellow as a friend of mine uses yellow but i think that may be a special case, thanks about the coating i really had no idea! :cheers:

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    Underemployed Genius Jacqui's Avatar
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    Yellow is the most used, but most shooters have several pairs in different colours to use in varying conditions.

    Contact Ian Jordan, check the member list, he has done several studies on tints and dyslexia.

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    For shooters there is a glass lens called Ambermatic and a similar one called Autum Gold that goes from yellow to brown. Yellow filters out the blue on hazy days, when the Sun comes up the brown provides contrast.
    Don't know of anything similar in plastic or poly that's out there.

    I suspect that DriveWear might be fairly good for this.

    Also suspect that if you look real hard with good light and a little magnification at the edge you could tell if a lens (plastic or glass) was surface tinted or through-and-through.

    Chip

    For Arc Welding I wouldn't fool around trying to self tint a lens for this, I would only use lenses that are specified for this. Just because it's dark it probably won't filter out all the UV and IR that can cause severe retinal and corneal burns.
    Last edited by chip anderson; 10-29-2008 at 05:47 PM. Reason: PS

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    ATO Member HarryChiling's Avatar
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    Quote Originally Posted by Shamanic View Post
    Guys, any chance on some homework help?

    What Filters or combination of filters would be suitable for the following?
    Target Shooting in hazy weather
    Skiing at high altitude
    Arc Welding
    For an extremly light senstive albino child
    For a dyslexic child

    Also,
    how can you tel if a tint is solid or coated on a glass lens?
    How does temperate effect photochromic glass?
    When is a neutral density tint useful?

    Cheers guys, my books just arent giving any clear answers
    Target Shooting in hazy weather
    -Polarized Yellow - The polarization will help reduce the scatter from suspended water droplets and the yellow accentuates the reference wavelegth that was used in the refraction allowing for less effect from chromatci abberation.

    Skiing at high altitude
    -Brown (non polarized) - Non polarized is the way to go, polarized lenses take away glare off of moguls and ice pathces making determination fo the land more difficult, at the high speeds on gains this can be dagerous, the brown shoul be more an amber color or blue blocker being higher altitude means more high energy visiable light blue blockers will help reduce that and provide a good contrast enhancement for recognition of object which can becoem important at high speeds down a hill.

    Arc Welding
    -Dark Green 85% - 90% absorbtion - Arc welding gives off high intensities of light as well as UV light and IR so make sure they block UV and are of a high density tint and the transmission curve reduces infrared, typically your greens.

    For an extremly light senstive albino child
    -Monochrome 600 80% to 85% - I have a lot of success with this tint, the transmission curves shows only a specific section of light that is transmitted while reduceing significantly the rest fo the spectrum.

    For a dyslexic child
    -Depends on what's comfortable for the child when reading - this can range from yellow through blueish purple, but will vary. Try looking up scotopic sesitivity syndrome for more infromation.

    how can you tel if a tint is solid or coated on a glass lens
    -from the edge a coatign is apparent by the color being only surface deep while the lens with solid color will be tinted from front surface to back lookign at the edge of the lens.

    How does temperate effect photochromic glass?
    -The chemicals in photoreactive lenses react less in lower temperatures, this leads to slower fade back times as well as acumulation of active state chemicals makign them appear super dark.

    When is a neutral density tint useful?
    -in enviornments that require color recognition for example an airline pilot would need a neutral color.
    Last edited by HarryChiling; 10-29-2008 at 06:09 PM.

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    Quote Originally Posted by Shamanic View Post
    how can you tel if a tint is solid or coated on a glass lens?
    On glass, look at the reflection on the back surface from overhead light. If its looks like A/R (purple hue) it is a surface coated glass lens, but if this reflection is a white, no-colour overhead light reflection then it is a solid glass tint.

    Also, a high + or - solid glass tint lens will exhibit a colour disparity in the lens against a white background... due to the thickness difference in the lens from center & edge. Also, if a solid tint lens has enough cylinder (say >2.00D) you will notice a 'banding' colour effect against a white background corresponding to the thinner/thicker meridians.

    Best you look for a better textbook(s).:D

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    cheers guys!

    i have all the textbooks on my reading list but i really think im gonna have to look for more!

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    am having doubt regarding tinted and filters
    how to make green tinted lens as green filters ? is there any way for achieving filter function? please help me out..

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