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  1. Replies
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    We did some tests and contacted Transitions, in...

    We did some tests and contacted Transitions, in fact it is a problem related to CR39 lenses and mainly to negative lenses.
    We had not noticed the problem before because we do not use CR39 in the...
  2. Replies
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    are slow stock, transitions 8 in CR607 (like...

    are slow stock, transitions 8 in CR607 (like CR39)
    the defect is not connected to the lateral radiation (I tried to exclude it but it does not change).
    the whole stock has similar problems.
    on the...
  3. Replies
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    transitions 8

    I would like to know if you happened to find lenses that after activation showed this type of defect14598

    14599
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    The reference in Europe is EN ISO 2187 and give...

    The reference in Europe is EN ISO 2187 and give you all the information
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    1,362

    14545 the standard use in the AR production.

    14545 the standard use in the AR production.
  6. Replies
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    937

    I have been dealing with coating AR design for...

    I have been dealing with coating AR design for many years but unfortunately I have never found any summary text on the subject. Generally manufacturers are very reluctant to release information about...
  7. Replies
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    the diagnostic procedure I suggest is the...

    the diagnostic procedure I suggest is the following:
    the problem appears only on the CR39 a or even on the high yes / no indices
    the problem appears only on lenses not hardened yes / no
    If they...
  8. Replies
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    But the trivex hard coat is the same chemical...

    But the trivex hard coat is the same chemical CR39 HC , so chlorine can attack HC... but I don't think concentrations, in a pool, are high enough
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    Opel not Opal Adam Opel is...

    Opel not Opal Adam Opel is the name of the founder of the company, later became Germanic nobles "Von Opel"
  10. Replies
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    1,484

    we use deep coat (tintable hard coat) and then...

    we use deep coat (tintable hard coat) and then colored (10-15% darkened), no delaminations, no polazrizations lost.

    we did it in some rare cases where glacier lenses took us.
  11. only a clarification UV A 315-380 nm ( some...

    only a clarification
    UV A 315-380 nm ( some literary sources say up to 400 nm)
    UV B 280-315 nm
    transmission data are +/- ok but culumn 5 and 6 are exchanged n°5 is UVA 315-380 and culumn 6 is...
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    I have a couple of CD1000 in my production...

    I have a couple of CD1000 in my production department, if you put the enlarged photo of the defects, I can suggest its origin.
    What degree of filtration do you use for the coating? (the suggested...
  13. Replies
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    2,156

    If you've colored a lens series transtions for...

    If you've colored a lens series transtions for color immersion ... you've probably ruined the hard coat layer.
    Usually the transition HC layer does not color smoothly and takes quite a long time .....
  14. Replies
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    I wanted to know if any of you then tried...

    I wanted to know if any of you then tried Kollodium and with what results
  15. Replies
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    7,323

    Price in Italy :biggrin:

    Price in Italy :biggrin:
  16. Replies
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    you can find it from any chemical dealer trade...

    you can find it from any chemical dealer
    trade names:
    kollodium 4%
    collodion 4%
    DAB 6
    it is cellulose nitrate in ethanol / dietyl ether CAS number 9004-70-0
    price ... if you buy from Merk 1/2...
  17. Replies
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    the simplest way to avoid slipping is to center...

    the simplest way to avoid slipping is to center the lens, brush a small layer of "kollodium" (the type from Merk in ethyl ether) to dry in 2-3 seconds and then apply a normal double-sided adhesive....
  18. There are a few too many questions that would...

    There are a few too many questions that would require a physics course at the university. A simple suggestion to deepen and to "play" with ARs is to see this site...
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    I suggest an excellent site where you can see the...

    I suggest an excellent site where you can see the emission spectrum of various devices, allows you to vary the light source and insert the simulation of various filters.
    Pay attention to the scale...
  20. Replies
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    if you want to play with the multicoat theory you...

    if you want to play with the multicoat theory you can find this online https://www.filmetrics.com/reflectance-calculator
    it's much simpler than the software we actually use to develop new coating...
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    personally I would like to replace the hard coat...

    personally I would like to replace the hard coat every 3 months but if you want to work without substitutions and with daily consumption I suggest you the empirical formula:
    1 total replace in 3...
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    4,851

    The water conducibility of "deinized water" is...

    The water conducibility of "deinized water" is +/- standard betwen .2 to .05 microsiemens (5-20 megaohm). note you can't obtain high resistivity because H2O is a polay molecola... and it conduce...
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    3,874

    we use an oscillating macchian sold by SCL but...

    we use an oscillating macchian sold by SCL but the abrasive as I buy from Saint Goben (Alundum ZF12 Grit code 69014135780 cheaply and the same origin 6 euro / kg). my suggestion is to prepare doses...
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    The Bayer test is a test of reproducibility with...

    The Bayer test is a test of reproducibility with many problems.
    That uses abrasive?
    The base in the test lenses is 5 +/- 1?
    What value of Haze get on CR39 lens? (Usually must be between 13 and 17)...
  25. this is the transmission of a 0/0 xtractive...

    this is the transmission of a 0/0 xtractive measure after 10 minutes in office light12516
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