NavList:

George wrote

> I have started a new threadname, as this is no longer addressing
> specific eye problems.
>
> Just let's start by eliminating one possible confusion, as these
> matters are already complex enough. In the same posting, Bill has used
> the same abbreviation, SD, which I take to refer to Standard Deviation
> and to Semi Diameter. Those terms should instead be spelled out, to
> avoid that confusion.

We are of the same mind on the SD vs SD issue.  Which I personally find
encouraging and you probably find scary. <G>  Generally I can make sense of
SD in context, but has the potential for confusion.  In fact, I did consider
that and spelled standard deviation out today before reading your post. Alex
appears to use "sigma" for standard deviation, but that is confusing to me
as well. What the heck, what isn't? I would suggest the traditional SD for
semidiameter (an odd term outside of cel nav and astronomy, much like 4SD,
seems to justify its existence by eliminating a little division).  STDV
could work well for me for standard deviation.  Thoughts?

I endorse your idea of staring a new thread for the scope focus and/or
chromatic aberration issues.  Much of it, although some list members appear
to have experienced just that, seems to run counter to common wisdom.

Yet unposted, a left eye comparison with and without glasses. (I arranged
the observations with vertical inversion first, right eye, left eye control,
then left eye with glasses so elevation did not change dramatically from
right to left, and left to left with glasses.)  It has the potential to
address the focus and hypothetical XY axis shift, but like combining
set/drift and leeway it may be impossible to nail down one from COG vs
course steered unless you know the other.

Bill


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