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  1. Replies
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    Johnny Winter - Fast Life Rider 1970 ...

    Johnny Winter - Fast Life Rider 1970


    https://www.youtube.com/watch?v=aICWp_0OqNU
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    Kinks - Waterloo Sunset 1973 ...

    Kinks - Waterloo Sunset 1973


    https://www.youtube.com/watch?v=Cyh__QQD2js

    https://twitter.com/rxgau/status/1197545835296436224
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    Martha Reeves & The Vandellas - Nowhere To Run...

    Martha Reeves & The Vandellas - Nowhere To Run 1965

    Backed by Motown's Funk Brothers


    https://www.youtube.com/watch?v=SbBcL0ztBww

    https://www.youtube.com/watch?v=BIikfdNIHQE
    ...
  4. As drk declared, if magnification is increased...

    As drk declared, if magnification is increased the field of view decreases and vice versa.

    The narrowing of field of vision is due to magnification at all angles of gaze. Increased add power also...
  5. Probably from different additives mixed with the...

    Probably from different additives mixed with the monomer. One additive might make it tint better, another to increase heat resistance, etc. A witches brew so to speak.

    Ideally the additive won't...
  6. Comparing refractive index only, (1.50 - 1.00) /...

    Comparing refractive index only, (1.50 - 1.00) / (1.60 - 1.00) = 0.83 or 17% thinner. But the surfacing center or edge thickness inputed will be the deciding factor, not the refractive index. One...
  7. For ophthalmic lenses and visible light, there is...

    For ophthalmic lenses and visible light, there is linear relationship between the speed of light through a material and the refractive index, but not with the material's level of dispersion, although...
  8. No. In the USA, it's lighter because it can be...

    No. In the USA, it's lighter because it can be surfaced thinner and still be as impact resistant as CR39.

    In general, as the density decreases, the index of refraction decreases. Conversely, the...
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    I did subscribe to W.C. Field's practice of...

    I did subscribe to W.C. Field's practice of always carrying a flask of whiskey in case of snake bite, and furthermore always carried a small snake.

    Albert King - Blues Power 1970

    Note that the...
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    Average White Band - Cut The Cake 1975 Qu'ils...

    Average White Band - Cut The Cake 1975

    Qu'ils mangent de la brioche!


    https://www.youtube.com/watch?v=bSq93Hsn0Bg
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    A Villain Who Unintentionally Always Does Helpful...

    A Villain Who Unintentionally Always Does Helpful Things


    https://www.youtube.com/watch?v=GPUgjy-Pn-4
  12. Guessing that the Rx is minus five-ish. Might...

    Guessing that the Rx is minus five-ish.

    Might be hypersensitive to chromatic aberration. Use less dispersive materials and zero out any prismatic effects on the primary gaze; e.g., prism thinning,...
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    America - Ventura Highway 1975 Purple rain. ...

    America - Ventura Highway 1975

    Purple rain.


    https://www.youtube.com/watch?v=pgMaQy66oCw
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    198,324

    Good groaners. Daughter: I want a Barbie and a...

    Good groaners.

    Daughter: I want a Barbie and a GI Joe for my birthday.
    Mother: Doesn't Barbie come with Ken?
    Daughter: No, she comes with GI Joe. She fakes it with Ken.
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    Bob Dylan - The Battle of Ira Hayes 1975 ...

    Bob Dylan - The Battle of Ira Hayes 1975


    https://www.youtube.com/watch?v=cV7fidI_IWQ
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    Jokes about eyes are awesome. The cornea, the...

    Jokes about eyes are awesome. The cornea, the better...
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    Hannes Otahal - Anitra's Dance Boogie 2008? ...

    Hannes Otahal - Anitra's Dance Boogie 2008?


    https://www.youtube.com/watch?v=LtMtD4lQJi0

    https://www.youtube.com/watch?v=3Xn8i98Iudc

    https://www.youtube.com/watch?v=J0odN0NSrIs
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    Doobie Brothers - Black Water 2020 Physically...

    Doobie Brothers - Black Water 2020

    Physically Distanced


    https://www.youtube.com/watch?v=4ZLY2ht9iBM
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    Steve Miller Band - Jackson Kent Blues 1972 ...

    Steve Miller Band - Jackson Kent Blues 1972


    https://www.youtube.com/watch?v=l0wIYxrhhPE

    https://www.cnn.com/2017/05/03/us/soundtracks-kent-state-jackson-state-orangeburg/index.html
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    Rolling Stones - I Got the Blues 1971 ...

    Rolling Stones - I Got the Blues 1971


    https://www.youtube.com/watch?v=FWWhX5BjVRw
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    Neophyte, Check out this thread: ...

    Neophyte,

    Check out this thread:

    https://www.optiboard.com/forums/showthread.php/56911-New-to-optics

    Hope this helps,

    Robert Martellaro
  22. No, and no. UVC. Burton is UVA. WRT to masks,...

    No, and no. UVC. Burton is UVA.

    WRT to masks, the link below has the latest info for N95 type masks. Surgical masks are probably similar.

    https://www.sages.org/n-95-re-use-instructions/
    ...
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    Milwaukee Without the Peoples

    https://vimeo.com/401803402
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    I doubt a professional driver would hit the road...

    I doubt a professional driver would hit the road without a spare tire, if they had a good mechanic.
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    From yesterday's NYT Help! My Mask Fogs My...

    From yesterday's NYT

    Help! My Mask Fogs My Glasses

    Health workers have a few tricks for solving this vexing problem, but it will take trial and error to find the one that works for you.

    By...
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