NavList:

For many years I had been skeptical of whole horizon mirrors thinking that they were for beginning navigators until I got a Cassens & Plath with a whole horizon on it three years ago and to my surprise the sight picture was fantastic. That didn't end my skepticism though so some varied observations were tried. The most convincing observation for the whole horizon was being able to observe a daytime Jupiter with it using a 4x40mm scope. The lone disappointment would have to be Polaris observations where a poorly defined horizon during late twilight combines with a dim star to really work against the light transmission abilities of the whole horizon. For those who enjoy taking lunars now and then the whole horizon does just fine.

Greg Rudzinski

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