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Re: [ATM] Sphereometer accuracy

Dominic-Luc Webb wrote:

>
>of 
>
>>paper and a light source. 
>>
>
>Yup, +/- a mm or so... I have thus far survived. I have not 
>yet worked a scope that had specs that could not tolerate 
>an actual ROC that differed from the specs by this amount. 
>Have a lot of (any) ATMs encountered such extreme requirements?
>
>Regarding convexes, I simply measure the tool, which 
>should be a very close replica.
>
We already have.  The tolerance suggested by Newport Glass for their
doublets is 1 part in 2000.  The six inch model has internal radii
on the order of +/-800 mm.  Assuming that tolerance level to be
correct, it works out to be +/-0.4 mm on the RoC -- a bit tighter.
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