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Dear Bill (Engineer),

> I think the SNO-T(sometimes designated SNO-T) is probably
> the best nautical sextant ever made.
> Mechanically, it is sound and the
> optics, by Zeiss, are superb.

This is an interesting statement:-)
I would never say this unless I tried really many sextants.

(In my Cel Nav career I tried an SNO-T, an Astra-IIIB,
a very old C.Plath (1900) and
a Tamaya-CLONE seriously, not counting a pocket sextant,
and
Astra-III-Professional, Cassens-Plath, Freiberger,
Husun (old) and an old used C. Plath for a short time
(let's say "in a store").

Of those listed above, SNO-T indeed seems the best,
but mainly because of its 6x scope.
The main disadvantage of SNO-T from  my point of view
is the "enclosed worm" construction.
This is supposed to protect it from dust and bugs,
but in fact it prevents you from
cleaning and inspection of the
worm screw. The same construction is shared by
Freibergers and some Belgian sextants.

> The SNO-M is not quite so easy to use
> for the beginner as it has only one telescope,
> a x6 that gives on
> inverted image,

This 6x inverting telescope seems to be
the most important feature
(which you do not find in other modern sextants).
I add that a "normal" 3.5x sextant telescope that
fits most modern sextants also fits SNO (M and T)
and it can be probably bought from
Celestaire. The factory package of SNO-T contains
two telescopes, the famous 6x and a standard 3.5x.

Alex.


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