망원경 자작정보 ~☆+

  • 28" Travel scope
  • 조회 수: 19776, 2011-12-23 19:56:34(2011-12-23)
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    Cloudy Nights 장터에 올라온 28" Travel scope 입니다.

    미국 나라 별쟁이의 다양함을 느끼게 합니다.

    미러 3장을 사용해 사다리없이 관측 가능한 구조입니다.

    그냥 눈요기 해 보시죠.

    근데 Travel scope가 맞나요??ㅎ

     

    원문 복사합니다...............

    Selling scope with optics, or just the optics.
    28" F/4.5 Nova Pyrex mirror in home made folded-Newtonian to view from the ground or step-ladder. No tool set-up, all knobs tighten by hand. All metal with two interchangeable optical configurations: 1.(shown) Folded-Newtonian with 3 mirrors. When aimed at 45 degrees, focuser height is 5.5 feet. Max eyepiece height when aimed at zenith is 7 ft, 1". I use a step-ladder. The 3 mirrors setup is the primary, 8" round flat and 3" elliptical near eyepiece. Setup #2. Newtonian includes parts for upper assembly with 5" secondary, holder and Crayford focuser. Scope structure dissembles for storage / transport in my Camry. Total weight, approx 170 pounds (including the 93 lb primary mirror). Rotational movement adjustable from a light touch to locked in place. Scope is balanced with a virtual counterweight of a cable and pulley connecting base to mirror box. As scope is moved up & down, tension from cable changes to keep scope balanced through it's range of motion. Base & side rings are chrome plated steel tubing riding on precisions bearings (base) and Teflon pads (sides). Best for medium and low power viewing. Images soften around 200x. Can be refigured locally for higher magnification.


    Optics:
    - 28" F/4.5 Nova Pyrex primary mirror made in '04, new coating in '08 by Composite Mirror Applications. Has 88% reflective coating. Weighs 93 pounds, 2" thick.
    - 8" flat, 1/10 wave or better. Ion-deposition coating by Spectrum Coatings. 98% reflective 'MaxR' coating.
    - 3" elliptical with enhanced coating, 93% reflectivity.
    - Brand new 5" Pyrex secondary by Discovery Telescopes. 96% enhanced reflective coating, 1/8 wave interferometer tested.
    - Brand new 5" secondary holder by AstroSystems.
    - Two eyepieces: Mead 56mm 2" Plossl (56x), DSO 42mm 2" Superview (75x).


    Scope with optics, $8500. Optics only, $8000

댓글 2

  • Profile

    김원준

    2011.12.23 04:39

    끼야옷!!

    헐~~

    정말 센세이셔블한 마난갱이네요 ㅎㅎ

    고정관념 완전탈피~~~

     

    아이디어가 정말 대단합니다.

     

    근데 광축은 어케 맞출려나요?ㅎㅎ

  • 박한규

    2011.12.23 19:56

    저 형식은 Nasmyth 망원경 또는 그 응용으로 보이네요, 보통 천문대에 설치된 거대 망원경에 사용하는 것으로 압니다.

    광축이 3번의 반사를 거치면서 틀어지므로 사경과 제 2 반사경은 보통 뉴톤식 반사 망원경처럼 하면 될 듯 합니다.

    주경은 홀로그래픽을 이용해야 하지 않을까 추측해 봅니다.

    참, 아이디어는 대단한데...불안정해 보입니다.

    제 꿈도 60" 나스미스 망원경 갖는 건데...

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