Re: New AP scope and more

From: RichA (none_at_none.com)
Date: 10/30/04 

Date: Sat, 30 Oct 2004 18:11:17 -0400

On Sat, 30 Oct 2004 17:40:41 GMT, "Alan French"
<adfrenchremoveallthis@nycap.rr.com> wrote:

>"RichA" <none@none.com> wrote in message
>news:bh36o0dsi4deq6vqthrnot8nqa2ut38oh6@4ax.com...
>>
>> Depends on how big were talking. No, I don't see 7" + apos being
>> available at low prices, but 6" and under are definitely coming
>> from the Orient.
>> [SNIP]
>
>Rich,
>
>Time will tell.
>
>The cost of glass depends on volume. More volume translates into more
>material, and higher energy costs for melting and properly annealing the
>blanks. I thought it would be interesting to see how big a factor this
>would be. I took 80mm as a baseline, with a volume/cost factor of 1. I
>assumed that the thickness of the blanks increases proportionately to the
>diameter. This also assumes that there is the same percentage of waste in
>cutting out the actual lens blanks (molded blanks are not really suitable
>for modern APOs). The cost difference is actually likely to be greater than
>the volume difference since it is likely harder to get larger pieces of the
>required uniformity, and it larger sizes the reject rate would be higher.
>
> 80mm 1.00
>100mm 1.95
>125mm 3.81
>150mm 6.59
>175mm 10.47
>200mm 15.63
>
>So the glass for a six inch lens alone should cost at least 6.59 times as
>much as that for an 80mm lens.
>
>Clear skies, Alan

Well, a 100mm is $999 and an 80mm is $500. Sounds almost
proportional.
And given the fact the Chinese have driven up the cost of energy
by 80% this year and aluminum by 100% over the last year and a half,
I'm hard pressed to see your equation at work.

So I guess the rumour of Burgess turning out $300 6" ED lens sets is
now false? :)
-Rich

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