"Jan Owen" wrote in message
news:z1Lof.35$_L5.8@fed1read06...
"Pete Rasmussen" wrote in message
news
On Thu, 15 Dec 2005 18:50:29 -0700, "Jan Owen"
wrote:

"David Sleeter" wrote in message
...

"Mean Mr Mustard" wrote in message
oups.com...
David Sleeter wrote:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7573092651

... but I can get a 6" objective in cell from D&G optical for the
same
price ... decisions, decisions ...

http://www.dgoptical.com/objective.htm

But it isn't a JAEGERS!


Given the choice between a Jaegers objective and a D&G objective of
the
same aperture, for the same price, most folks *I* know would choose a
D&G
EVERY time...

Yes, the Jaegers has a certain nostalgic connotation, but when it
comes
down to optical quality between a D&G and a Jaegers, well... D&G all
the
way...

Oh, I don't know about that. D&G does make great optics but
historically they have been VERY reluctant to tackle good, moderate or
faster f/ratio achromatic lenses where Jaeger's has not.

I and a few others have certainly heard/known of a few mixed quality
reviews of the speedier Jaeger's objectives (in the 6" class
particularly) but what I've seen of each of several various examples
in all f/ratios was that quality was exceptional in each case!

So, ha ha ha! ;-)

I've seen some very good (excellent, actually, though my personal tastes
in refractors are more toward apos than achros) Jaegers objectives in
telescopes. And I've seen some fair ones. I've never personally seen a
BAD one, so I refrained from commentary within that context, and left
out
the stories that circulate OUTSIDE my personal experience.

I would still characterize the overall highest PERCENTAGE of excellent
achromatic objectives as likely to come from D&G, though I've certainly
seen excellent examples of Jaegers' objectives as well...

Perhaps the reason we don't see many D&G scopes with focal ratios below
f/12, is because they are committed to producing uniformly high quality
objectives consistent with their reputation, and realize that it's not
easy to consistently deliver the quality they're committed to at shorter
focal ratios, especially in the price range they work within...

Regardless, I sure wouldn't buy ANY telescope, or objective, on E-Bay...

--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail
address...
Latitude: 33.6
Longitude: -112.3


Some further clarification; an achromatic objective in the 5" aperture
range and up, even with EXQUISITE optics, is going to show color at f/12,
and the further you go below f/12, no matter if the optics are essentially
PERFECT, there will be progressively more and more color, the shorter the
focal ratio...

If one's expectation is for high performance lunar/planetary images at
short focal ratios, that's an unrealistic expectation for an achromat.
With those expectations, one must be prepared to move into the apochromat
class...

Or be happy with what a quality achromat CAN deliver... Which is plenty,
given one's expectations are realistic. And what they DO deliver is why
D&G remains in business...

--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3