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Re: [UncensoredTakGroup] Re: TOA 130

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  • Markus Ludes
    In the translation I can read that they use a large airgab between the lenses to get this good correction. Will this not be negative for cool down time ? Large
    Message 1 of 40 , Nov 1, 2002
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      In the translation I can read that they use a large airgab between the lenses to get this good correction. Will this not be negative for cool down time ? Large air between takes longer than small air gap. Any info about that ?

      thanks

      Markus
      ----- Original Message -----
      From: jhapeman1
      To: UncensoredTakGroup@yahoogroups.com
      Sent: Friday, November 01, 2002 3:28 AM
      Subject: [UncensoredTakGroup] Re: TOA 130


      My understanding from the translations is similar...they are
      claiming that it achieves apochromatic correction with less inherent
      spherochromatism than other apo designs. The argument is that the
      typical three-element apo loses contrast due to the inherent
      spherochromatism in the design. This is why they used flourite and
      created the doublet FC and FS series...and why many Tak people (and
      non-Tak people) comment on the superior contrast of the Taks
      compared to many other unnamed triplet apos <g>. The claim here
      appears to be that they have found a way to get around this, and the
      graphs they show would seem to support this claim.

      Someone who is an optical expert can jump in here and correct
      me....regardless, I am expecting to get one later on, as I have
      ordered one of the 4" models and I hear they will ship later than
      the standard models.

      Jeff Hapeman


      --- In UncensoredTakGroup@y..., Gene Horr <genehorr@t...> wrote:
      > Ron Wodaski wrote:
      > >
      > > It works, but that translation is seriously fractured. Anyone
      here know
      > > enough about optics to translate the translation? <g>
      >
      > Well, I've worked with Japanglish enough...
      >
      > Basically it is stating that this design provides better
      correction
      > at the higher and lower bandwidths, particularly for
      sphero-chromatic (sp?)
      > errors. The latter is what it is harping on.
      >
      > It also stresses the IR and UV correction for CCD use.
      >
      > Gene Horr
      > genehorr@t...


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    • Rainer
      Hi Steve from Australia, My name is not Saludos but Rainer :-) Saludos is greetings in Spanish :-) greetings Rainer ... could ... how ... the ... talk ... high
      Message 40 of 40 , Jul 9, 2007
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        Hi Steve from Australia,

        My name is not Saludos but Rainer :-)

        Saludos is greetings in Spanish :-)

        greetings Rainer



        >
        >
        > Not a bad idea Peter, I have the same problem as Saludos if you
        could
        > call it that. Nobody likes dust on the objective, goodness knows
        how
        > it got there in the first place. I suppose it's easy enough to
        > unscrew the rear flange off the tube and poke a tube up there as
        the
        > distance to the rear element is not that far, I'll just have to
        talk
        > myself into doing it though.
        >
        > Cheers,
        >
        > Steve
        > Australia
        >
        >
        > "exfso" <millerp@> wrote:
        >
        > A bit scary removing the whole cell. Surely some high pressure air
        > down the scope from the focuser end through a flexible tube would
        > remove the offending dirt. Obviously firstly checking that the
        high
        > pressure air is clean and no possibility of contaminants. A
        hurricane
        > blower with an extension tube attached should do the trick. Just a
        > suggestion, anything is better than possibly messing up collimation.
        >
        > Cheers
        >
        > Peter
        >
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