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    MLaferriere's Avatar
    MLaferriere is offline SUPER GIANT
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    Default CG5 bumping into itself



    I finally had a productive night last night after an interesting start of the summer. Went out one time, calibrated Cassiopeia upside down so it threw everything off and wasted a few hours, clouds. Went out, got everything set up, couldn't find Bahtinov, re-ordered one on Amazon a few days later. Went out intending to image, got carried away playing with my new Orion SSAG and PHD and when I finally had everything dialed in properly, mount, alignment, PHD etc. CLOUDS. Went out last weekend, spent about half hour getting everything correct, turned around to get something and heard a loud twang as I felt something on my ankle. I had not only pulled the plug out of the mount, but also the wire out of the plug. GRRRRR.... Not sure how many times I redo darks on the SSAG and wind up leaving the lens cap on, even though it tells me to remove it. It takes me sometimes around 5 - 10 minutes to figure that out. My hand over the objective seems to have solved this. The longer I mess and fiddle around the more time the clouds have to rally up their friends just over the horizon

    Well the boring stuff now out of the way, seemed like a good night, everything aligned and calibrated well. Caph came right near the center of the camera's view for my first calibration star! Did a 2+4, all star polar, power down, 2+4 to check it and it was pretty accurate. Nice! Twiddled around with PHD and finally figured I would shut off the declination guiding, the graph stayed perfectly straight and the images seemed to come out better as well. This was with a Celestron C90 on my CG5GT and the Orion miniguider package. Five minute subs! Much better than the 2 or so I was getting unguided. Sweet! Set up RealVNC so I could watch the laptop from the bug free air conditioned interior of my house. Gave BackyardEOS almost two hours to work on M22. Almost an hour into this, I noticed PHD spiked in the RA really bad. Then it came back to normal, the image looked 'smeared' so I figured maybe the meridian flip? The next image it spiked as well. Figured I'd go outside and see what was going on. I could hear the mount groaning under a heavy load. The mount had twisted into itself. This was on M22 at just around 1AM. I should have photographed it but still wanted to use the camera for darks and flats. Using Stellarium to figure where it was aimed would have been roughly +187°39'20" / +23°37'16". I have the mount limit set to block 15° over the horizon. Would the best bet be to set it not to use anything 25° or less? It seems like it would block a lot of sky even though there’s a lot of atmosphere that low.

    This has happened to me in the past and usually when viewing objects low and to the south. It is the housing of the declination motor bumping into the RA's plastic housing. Any thoughts, ideas etc? Take off the plastic covering the inside...?
    Explore Scientific 102mm apo, Orion ST80A, Celestron C90, Canon 50mm F1.8 lens, Celestron 8X42 Nature DX
    CG-5 GT, Explore Scientific Twilight 1, & half a barn door mount (almost finished), Canon 7D, Orion Magnificent Mini AutoGuider, ZWO ASI120MC-S
    ES 82° 2" 6.7mm, 18mm, 30mm, Meade Series 4000 1.25" 25mm plossl, & Celestron 1.25" 32mm plossl eyepieces.

  2. #2
    MLaferriere's Avatar
    MLaferriere is offline SUPER GIANT
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    Default Re: CG5 bumping into itself

    I think I may have found it! The mount allows you to set the R/A limits. Figured since the mount was bumping into itself as I just have a short C90 on it, Celestron would have set these limits at the factory.
    Explore Scientific 102mm apo, Orion ST80A, Celestron C90, Canon 50mm F1.8 lens, Celestron 8X42 Nature DX
    CG-5 GT, Explore Scientific Twilight 1, & half a barn door mount (almost finished), Canon 7D, Orion Magnificent Mini AutoGuider, ZWO ASI120MC-S
    ES 82° 2" 6.7mm, 18mm, 30mm, Meade Series 4000 1.25" 25mm plossl, & Celestron 1.25" 32mm plossl eyepieces.

 

 

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