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Alexander wrote:

> 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.
>

I have to agree with Alexander here. I owned a Frieberger which appears to be 
exactly the same construction as the SNO-T. In addition to the points that 
Alex made, I can add another: the worm screw release clamp is constructed 
such that aluminium pivots on aluminium. This is bad news as with continued 
use, the aluminium tends to bind and thus requires the user to dismantle the 
whole thing, re-grease it and put it back together again. At least this was 
my unhappy experience with this particular model.

I have never used an SNO-T but if it is in fact, just a Russian version of the 
Frieberger, then I have to respectfully disagree with the notion that it is 
the best sextant ever made. That honour, in my humble opinion, goes to 
C.Plath and Cassens and Plath.

Another two bits' worth from the cheap seats.

Robert


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