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  1. 09-20-2016, 07:53 PM

    Thread: Magnification helps get a great edge

    by Brontosaurus
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    2,944

    Hence the use of an achromat.

    Hence the use of an achromat.
  2. 09-20-2016, 04:57 PM

    Thread: Magnification helps get a great edge

    by Brontosaurus
    Replies
    14
    Views
    2,944

    Not to muddy the waters, but ancient...

    Not to muddy the waters, but ancient Mesopotamians and ancient Romans were using polished quartz as magnifying glasses.

    I find a 10x achromat triplet to be useful in checking the bevel (reflected...
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