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Thread: Zero out of two....

  1. #1
    goldstar's Avatar
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    Default Zero out of two....



    After 3 weeks of waiting Santa finally brought me a clear night on Christmas day. You may have seen my thread about my new VisionKing 80 mm f 7.5 that turned out to have a defective Crayford dual speed. I made it useable but was then waiting on the star test hoping for some redeeming performance. Alas and alack!
    I turned it on the Pleiades and thought I had discovered a comet swarm! The whole field had coma right across-large flaring stars even at x 30.
    Rotated EP with no shift in the flaring, checked that the diag. had not been jarred out of place, put diag. and EP on my 80 mm f 8 guide scope and the image was perfect as ever. I considered enrolling in anger management counseling right then....
    The scope performs only two functions- focusing and imaging. Failed on both. Not interested in a replacement only a refund which will go toward another different, better, more expensive glass.
    I had some consolation when I re-purposed the mount back to my CR 6 on AVX and auto guider for AP. I was seeing some DEC guiding errors a month ago. I tuned up the DEC drive chain and noticed a probable cause. The backlash setting seems to work by giving the gears an initial fast acceleration. This was causing bumping due to the high backlash setting of 50 (supposedly about normal). I reduced it to 5 so that the gears come at it slowly. Now beautifully smooth guiding-no more little jumps in DEC.Hooray!
    DeanD, helicon64, Leveye and 5 others like this.
    CR 6 150 mm f8 refractor . AVX mount. 80mm guide scope with Nexguide. Canon EOS rebel 3 Ti DSLR. Canon Rebel XS DIY modified I- Optron skytracker. Sky Watcher 8 inch collapsible Dob. 30 mm, 25 mm ,20 mm, 15 mm, 10 mm ,8.8 mm EPS plus plus plus. Cometron 12 x 70 binos. Sky Watcher PRO ED 80 mm. Canon XS modded. Lots of hope.

  2. #2
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    Default Re: Zero out of two....

    Good news bad news.

    Sorry the VK did not work out for you. Interisting about the backlash compensation. I have been putzing around with that a little myself but with a lack of success. I tried a really high setting as suggested by guiding assistant and it all but ruined the guiding with jumps out to 4' and more.
    Scopes: Home brew 6" Dob, Orion XT8G, Orion 130mm APO Triplet, Orion 8" f3.6 astrograph, atop a Orion Atas pro AZ/eq-G - Guiding: Orion 60mm f4 scope, Orion 'Star Shoot' autoguider camera, PHD2 software - Cams: Orion MP5 planetary ccd, Cannon Rebel SL1 (EOS 100D), BYEOS software, ATIK 383L+ Processing : Regisax, Deep Sky Stacker, Star Tools Assistant: One very large cat


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  3. #3
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    Default Re: Zero out of two....

    Take out the lens cell and remove the lens group then re-seat the spacers ( if it has them) and the doublet and then just gently snug the retainer ring. It might just be pinched optics.
    My eyes
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    1984 Meade 2120 10" SCT- 1998 U.S.A. made Celestron C8 SCT -StellarVue SV80ED Doublet- 1960's Homemade 6" F5.6 Newt - Astro Tech AT8IN Imaging Newt- Vintage 1961 H.O.C. made ATCO 80mm/1200mm refractor w/ original vintage eyepieces - Zhumell, Orion, Astro Tech 9x50 finderscopes - Orion Atlas AZ/EQ-G
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  4. #4
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    Default Re: Zero out of two....

    Thanks Leveye. I did consider that but with the focuser defective as well I felt pretty sour about the whole scope. It was like buying a new car with square wheels and a shot engine. I could fix both (probably), but for why do we get a guarantee?
    DeanD likes this.
    CR 6 150 mm f8 refractor . AVX mount. 80mm guide scope with Nexguide. Canon EOS rebel 3 Ti DSLR. Canon Rebel XS DIY modified I- Optron skytracker. Sky Watcher 8 inch collapsible Dob. 30 mm, 25 mm ,20 mm, 15 mm, 10 mm ,8.8 mm EPS plus plus plus. Cometron 12 x 70 binos. Sky Watcher PRO ED 80 mm. Canon XS modded. Lots of hope.

  5. #5
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    Default Re: Zero out of two....

    Congrats on getting your mount issues worked out. I've still got to work out the RA and DEC backlash settings of my C6R-ASGT since I cleaned and re-meshed the gears. Best of luck on the imaging.

  6. #6
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    Default Re: Zero out of two....

    Quote Originally Posted by goldstar View Post
    Thanks Leveye. I did consider that but with the focuser defective as well I felt pretty sour about the whole scope. It was like buying a new car with square wheels and a shot engine. I could fix both (probably), but for why do we get a guarantee?
    I agree! If it was second-hand you could try re-seating the lens elements, but there is no guarantee that they are ground/polished properly anyway, and you could void the warrantee if you fiddled with it. Personally, I would be checking out something like the Orion ED80, Skywatcher Pro ED80, or (my preference!) the Stellarvue SV80. They are more expensive, but much more likely to be of satisfactory quality.

    Good luck!

    - Dean
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    Telescopes: 12" home-made dob, Takahashi TSA102, Televue 76, Celestron 800CPC
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  7. #7
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    Default Re: Zero out of two....

    Yes DeanD ! I promptly bought the Skywatcher Pro 80 ED. A much better piece of kit. Arrived today, set up at home and it looks goooooooooooood.
    Great dual speed, terrestrial views are fine. Guide scope is attached and all is balanced ready to go. I'll say more if the skies clear this side of doomsday....
    DeanD likes this.
    CR 6 150 mm f8 refractor . AVX mount. 80mm guide scope with Nexguide. Canon EOS rebel 3 Ti DSLR. Canon Rebel XS DIY modified I- Optron skytracker. Sky Watcher 8 inch collapsible Dob. 30 mm, 25 mm ,20 mm, 15 mm, 10 mm ,8.8 mm EPS plus plus plus. Cometron 12 x 70 binos. Sky Watcher PRO ED 80 mm. Canon XS modded. Lots of hope.

  8. #8
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    Default Re: Zero out of two....

    Sounds great: and that was quick!!! Congratulations, and I hope it performs as expected. Good luck with the clouds, and we will look forward to your first light review!

    All the best,

    Dean

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  9. #9
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    Default Re: Zero out of two....

    Quick delivery indeed. I am lucky that I live in the B and H fast delivery area (delivery 2nd day after ordering). I used to live in New York City where I could just take the subway down to the "store" and pick up. That store itself is an experience to be enjoyed. It's devoted to video, photo, audio and some astro. I used to salivate whenever I went in there! If there is something the staff don't know then its probably not worth knowing. This may sound like I am plugging B and H but I have had nothing but excellent service from these guys. I even applied for a floor sales job with them once but didn't get it. No grudge! If you get the chance on a visit to NYC and you are astro/photo/video inclined , I recommend a stop in B and H, 9th Ave at 34 St. I think it should be included in the tourist "must visit " agenda!
    DeanD and bladekeeper like this.
    CR 6 150 mm f8 refractor . AVX mount. 80mm guide scope with Nexguide. Canon EOS rebel 3 Ti DSLR. Canon Rebel XS DIY modified I- Optron skytracker. Sky Watcher 8 inch collapsible Dob. 30 mm, 25 mm ,20 mm, 15 mm, 10 mm ,8.8 mm EPS plus plus plus. Cometron 12 x 70 binos. Sky Watcher PRO ED 80 mm. Canon XS modded. Lots of hope.

 

 

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