RE: [ATM] Ross null test?

["lou krajci" <loukrajci@comcast.net>]

>From: Ric Rokosz [mailto:radicell2@yahoo.com]

> No.I've never tried the Waineo,as the Ross is
>"cheaper " in that you don't have to send the lens out
>to get coated plus the risk of third party handling.

OK, you have to pay for a mirror coating for Waineo/Maksutov null, but to
make the Ross lens...you need to work two surfaces, control wedge, check the
glass for striae/inhomogeneities?  Doesn't that make the Ross lens more
expensive?

>The added advantage of the Ross is that it can be used
>to null out the reference element (hyperbolic) when
>making Cass secondaries ,be it the normal Cass or the
>Ritchey - Chrieten type.A big plus in my view..

Do you mean the Ross null test can test concave aspheres, other than
paraboloid?  If yes, then the Waineo/Maksutov can do the same, if I
understand it correctly.

Tom Krajci
Albuquerque, New Mexico
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