Re: so called new approach to design doublet APOs. ;>)

From: Mook (markolsen_at_eunu.net)
Date: 11/21/04 

Date: Sun, 21 Nov 2004 01:39:56 -0600

Aaaaaaah Soo! Charlie Chan was right!

Mark

Tom Davis wrote:

> "ValeryD" <aries@mercury.kherson.ua> wrote in message
> news:5c4a4ee7.0411200016.17aa60dd@posting.google.com...
> > Dear Mr. Back,
> >
> > Sure, your self-confidence has no limits. And as one, well known
> > in optical design and manufacturing, person said, someday your head
> > will explode due to your unlimited self-confidence.
> >
> > I should mention specially for your instance, that ARIES 7" F/8
> > Fluorite
> > objective you saw at one StarParty (AstroFest?) which was with
> > cracked fluorite element has the design, which is essentialy the same,
> > as you called "truly a new level of performance in the fluorite
> > and ED doublet market". Also, I should to note, that these ARIES
> > objectives were designed and made about 7 years ago. The largest one
> > was 12" F/9. And right now we making tubes for a serie of 6 such 7"
> > F/8
> > Fluorite doublets.
> > It will be useful to note also, that these doublets has color
> > correction,
> > that in 430nm-656nm range, is same good as LZOS made TMB 6" F/8 Super
> > SD TRIPLET. And, of course, such objectives has better contrast, that
> > these
> > triplets (include 175mm ones) because they have two surfaces less,
> > shorter
> > lightpass in the glasses. These doublets also have significantly
> > shorter
> > colldown time. Objectives have lesser mass and a telescope has better
> > balance.
> >
> > Of course, I am not a first person, who know this approach to APO
> > doublets
> > design and manufacturing. So, this approach to design can't be called
> > as
> > "truly new level". Please, note this specially for yourself.
> >
> >
> > VD
>
> Valery,
>
> I think a bit of clarification is needed here. This lens is not a TMB
> design,
> it is one of the Chinese manufacturer. What is amazing here is that they
> are doing this to a high quality level at such a low price. In this
> respect,
> it is a truly new level, as it brings high performance optics down to a
> price point many more will be able to afford. This is the sort of thing
> you have attempted to accomplish with the Chromacor.
>
> What this scope represents is the first true APO design from China. I
> own an Orion 80ED along with the new Burgess fluorite, and have
> done enough side-by-side comparison of these two scopes to know
> the fluorite is better corrected in every way. I can detect zero color
> on this scope on any object in-focus, and only the barest traces of
> color in the rings outside of focus on Sirius, and that is so subtle as
> to be almost non-existent. Besides that, the star images are clearly
> tighter than the 80ED, and contrast is noticeably better as well.
> It takes Chinese optics to the next level.
>
> I've seen way too many personal attacks between optical manufacturers
> of late. As I had experienced with the Chromacor, I have been taking
> the brunt of the bashing over this product as well. I have been willing
> to do so because I believe it is a product that others will really be
> pleased
> to own an use, and I wanted its merits to become known before others
> managed to make it disappear, or worse yet, someone like Meade or
> Orion snatched it up and charged twice the price for it.
>
> As for your designs and their capabilities, I have a great deal of respect
> for them. I have no doubts you came up with a similar design well before
> this. Again, the real point to this is that other than high-end optical
> manufacturers like yourself or Roland (who has also come up with some
> fine doublet designs in the past), none of the more common manufacturers
> are using this type of design. To make this design available at such a
> low price point is the real innovation here. I applaud Bill and Thomas for
> passing the cost savings on to the rest of us rather than profit gouging
> as is the common practice in business today (in general, forget optics
> here).
>
> Thanks, Tom Davis

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  • Re: so called new approach to design doublet APOs. ;>)
    ... > cracked fluorite element has the design, which is essentialy the same, ... > It will be useful to note also, that these doublets has color ... I've seen way too many personal attacks between optical manufacturers ...
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  • Re: so called new approach to design doublet APOs. ;>)
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