Re: [ATM] Ross null test?

["Mel Bartels" <mbartels@bbastrodesigns.com>]

>     As with any null test, the key advantage of this method is the ability
> to directly see the size and location of the defects on the mirror without
> the need to refer to a graphic representation.  My past use of the Dall
null
> test showed this to be a significant advantage in visualizing exactly
where
> to work the surface.


I have relied on this for many many years of mirror figuring.  You can
always get a reading for overall correction with a star test.

Mel Bartels

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