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crashtestdummy

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    rock climbing
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    west yorkshire

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  1. crashtestdummy

    hmmmm plate glass at £110 or borosilicate at £300?

    1. Show previous comments  2 more
    2. ronin

      ronin

      This almost looks like it but doesn't seem to have the detail I recall.

      http://www.skyandtelescope.com/howto/visualobserving/3305656.html?page=2&c=y

    3. ronin

      ronin

      Will agree that if the first then start cheap, my first scope was my cheapest - after 4 it is still the one I use most. All the others are better and bigger. There may be a lesson there.

    4. crashtestdummy

      crashtestdummy

      yeah have seen that which is what has had me wondering.at the moment for me the only reason to go for the pyrex blank is its thickness will provide less flex when grinding

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