Re: TMB 100mm F/8
From: Tom Davis (tdavis11_at_carolina.rr.com)
Date: 11/25/04
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Date: Thu, 25 Nov 2004 18:48:40 GMT
"Ted Kord" <tedkord@excite.com> wrote in message
news:7c0be594.0411250532.346536c@posting.google.com...
> *sigh* Yes, Valery. Nobody knows what is what except you. All of usenet
> bows
> to your superiority. You make the best telescopes ever, and the best that
> will
> ever be made. You are all knowing.
>
> By the way, Tom Davis wasn't saying that Chromacor wasn't good, just not
> as
> good as you say...Now why does that sound familiar?
Ted,
Exactly my point. Sol Robbins has a fine setup with the Chromacor II
and a good CR150 to use it with. My point was that the Chromacor is
only as good, or bad as the intrument it is used in, and also that it has
maintenance issues related to the use of it that make a high quality APO
preferable to it, price independant. Also, while I found the improvement
in color correction to be significant, I did not near the level of
correction
found in a TMB 100/800 when using it in a 120mm F/8.3 Konus with
ideal spacing. Also, I tried to make clear that even with the spherical
correction feature, other optical issues inherent in the general run of
Chinese achromats prevents the theoretical capabilities of the device
from being attained in most real-world use situations. It was not intended
to belittle what Valery accomplished here, but rather to show that a
scope designed as a complete package would be preferable, price
independent. I believe Valery has discussed developing such a complete
package, and at that point such a comparison could be made, and the
results would be valid.
Thanks, Tom Davis
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