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  1. #1
    Ioannis's Avatar
    Ioannis Guest

    Default The importance of a good Finder



    On my first visit to Antiparos, a year ago, I only carried with me my
    11x80. This time I carried my 60mm/700mm Tasco as well, along.

    One thing that became apparent as I was browsing through "Turn Left",
    besides the Tasco's finder being absolutely useless, (the 5x15 finder
    consists of two lenses, and after unscrewing the main lens, I saw that
    it was stopped down to f20 or something such, the actual hole was 5mm!
    (no wonder since the main finder lens consists of one element, so it had
    to be made achromatic)), was the importance of having a good finder.

    I spent half of my time searching through known M objects, trying to
    locate them through the Tasco. After being located, the T did a good job
    overall, but trying to find less bright objects, such as some of the
    NGC's in Cass, proved to be a mazochistic torture.

    One month ago, I looked through my neighbour's Meade 125ETX/EC, and its
    finder was almost as useless. We spent most our time trying to locate
    the objects. Goto was not available, so we tried the Equatorial mounting
    and after aligning, even locating M31 was a pain in the butt, trying to
    not de-align the mount. From the Athenian sky, M31 was _not_ visible in
    the finder. Go figure...

    For practical reasons, I don't think that aligning giant binos with a
    small telescope is very usable, particularly since the field of view of
    my 11x80 is very big compared to that of the Tasco.

    But I think that even a badly aligned good finder would sure beat a no
    finder, at all.

    Knowing that the object is _within_ the field of view of the Tasco,
    certainly helps in the identification, even if the object is slightly
    off. All that matters is picking it up for the first time.

    I am thinking of aligning the Tasco with the 11x80, using the same
    tripod, where both scopes can be screwed against a horizontal truss,
    which in turn can be screwed against my tripod:

    O-O O
    |-----|
    |
    +
    / \

    The Tasco doesn't have any clamp rings however, so I'd have to unscrew
    these horrible side screws, and ask my engineer to either design two
    tube clamps or two rings with screws.

    The rings with screws are these where the ring is larger than the tube,
    the scope slides through and there are 3 screws which provide for
    micrometric adjustment, similar to those found on finders.

    If I use tube clamps, I lose any micrometric adjustments, so I don't
    know how I can do the alignment, particularly since the entire thing
    needs to be disassembled during the trips.

    If I use rings with screws, the screws will have to screw against the
    Tasco tube itself, possibly damaging it. So I get micrometric alignment,
    but I also get scratches and dents on the tube.

    Anybody has any better ideas on how I can better align these two?

    The 11x80 already has a screw in support for the tripod as it is, so the
    only thing that needs to be done is extend the base truss and tell my
    engineer what to do for the Tasco tube.

    Thanks much in advance, and happy observing!
    --
    Ioannis
    http://users.forthnet.gr/ath/jgal/
    ___________________________________________
    Eventually, _everything_ is understandable.

  2. #2
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default The importance of a good Finder

    I know that some folks really like an optical finder, but I have found that
    a 1x finder (I like the Rigel Quickfinder) coupled with a low-power
    wide-field eyepiece works for me.

    Dennis

    "Ioannis" <morpheus@olympus.mons> wrote in message
    news:3F8F073E.7BE6@olympus.mons...



  3. #3
    Michael A. Covington's Avatar
    Michael A. Covington Guest

    Default The importance of a good Finder

    What diameter of finderscope will fit into the present finder mount on the
    Tasco?

    There are some pretty good 5x25 finders in existence, such as the one that
    used to come with the Celestron 5.



  4. #4
    Al's Avatar
    Al Guest

    Default The importance of a good Finder

    I'm one of the people who use and enjoy the optical finder. I had a Telrad
    and found it to be worthwhile but not under the light polluted skies in my
    area. With no magnification, you couldn't see many of the sign post stars,
    making it very difficult to starhop. On the other hand, the 50 or 60mm
    finder will allow you to see many of these stars which would otherwise be
    invisible. But here is a question I have regarding finders to which I never
    had an answer that made any sense...

    I use a 50mm straight through finder on both of my SCTs. What I usually do
    (and I find this very natural) is view through the finder with one eye and
    view where I want to go with the other (in other words I keep both eyes
    open). While you're doing this, your brain reports a dual image until you
    have lined up the scope with the star you were looking at with the unaided
    eye. I could usually manually slew the scope to the new location in
    seconds. Now here comes my question: I've seen guys change the finder on
    their SCTs from the straight through to the finder with a built in 90 degree
    diagonal. What is the benefit in doing this? Of course, I could understand
    doing this with a Dob, but why do it with an SCT or a refractor?

    Al


    "Dennis Woos" <dpwoos@gmavt.net> wrote in message
    news:vou37m6r2fg3c6@corp.supernews.com...
    that



  5. #5
    Frank Bov's Avatar
    Frank Bov Guest

    Default The importance of a good Finder

    Al,
    If someone puts on a right angle, correct image (RACI) finder, they get an
    image that matches their charts. If it's just RA, maybe they mount it low
    enough it's hard to get behind when pointed high in the sky.

    I've got a straight through on my SCT and a normal RA on my Dob and I find
    I'm handicapped by an erect image. I'm so accustomed to the image reversal,
    I can't move the scope where I want!

    HAve fun,
    Frank

    "Al" <aocc1bugoff@optonline.net> wrote in message
    news:tKEjb.9227$%B2.4323404@news4.srv.hcvlny.cv.ne t...
    .... Now here comes my question: I've seen guys change the finder on
    degree
    understand



  6. #6
    Marty's Avatar
    Marty Guest

    Default The importance of a good Finder

    I use a red dot pointer to find a "starting star" with my C8 SCT, and
    then a right angle 50mm finder to starhop to my target. The right angle
    is simply to give me a more comfortable angle to look through the
    thing... no way could I screw myself under the scope to look toward the
    zenith without it. I don't have too much trouble flipping the view to
    fit my charts, but someday I may break down and get one of those fancy
    correct image thingys.
    Marty


  7. #7
    Al's Avatar
    Al Guest

    Default The importance of a good Finder

    Thanks for responding, Frank!

    Al


    "Frank Bov" <frankbov@rochester.rr.comic> wrote in message
    news:X4Jjb.59928$uA2.58468@twister.nyroc.rr.com...
    reversal,



  8. #8
    Bill Becker's Avatar
    Bill Becker Guest

    Default The importance of a good Finder

    Good to see ya back, Frank. Where you been?

    Best regards,
    Bill

    "Frank Bov" <frankbov@rochester.rr.comic> wrote in message
    news:X4Jjb.59928$uA2.58468@twister.nyroc.rr.com...
    reversal,



  9. #9
    Frank Bov's Avatar
    Frank Bov Guest

    Default The importance of a good Finder

    Just busy . . .

    "Bill Becker" <bbe51@rmisp.com> wrote in message
    news:bmpvv0$p38e4$1@ID-128382.news.uni-berlin.de...



 

 

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