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  1. #21
    Mustafa Umut Sarac's Avatar
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    If I am not wrong , the problem is to create a bright focusing screen.
    At first at minolta than at Hasselblad , they used plastic screens which crafted with mixing polymer and transparent fibers. Transparent fibers created a internal surface for focusing.
    Why you are not creating focusing screens from acrylic , polyester or clear epoxy ?
    May be an idea but worth to study.
    I will look to the patents and write again

    Best ,

    Mustafa Umut Sarac

  2. #22
    DaveOttawa's Avatar
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    Quote Originally Posted by Roger Hicks View Post
    Dear Struan,

    The perfect analysis. I'm sure it works; I'd be confident I could take adequate precautions; and I'd still consider it more trouble than it's worth.

    Cheers,

    Roger
    FWIW I concur, and yes I have personally used HF based reagents in both semicon & metal finishing environments. It was only just worth the trouble in a professional, "I was getting paid for it and had a full rubber suit etc etc and a safety drench shower and gluconate first aid kit and panic buton within reach" environment.
    Also FWIW it's weak acid not a strong, acid using those terms in the chemical jargon not colloquial sense. But that isn't important to the OP's practical application, HF is unusually hazardous.
    Last edited by DaveOttawa; 09-23-2007 at 05:45 PM. Click to view previous post history. Reason: weak/strong acid bit.

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