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  1. #1
    WWPierre's Avatar
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    Default Polar Alignment Question



    As you probably already know, I recieved an EQ2 as a Christmas gift from a complete stranger. This "freebie" has opened a real can of worms. I had intended in buying a light, modest scope for it, and using it to experiment with webcam astrophotography.

    Then I found the Mak on E-bay, and reasoned that although it would exceed the capacity of the mount, I could probably beef up the mount to handle the extra weight......yeah, right! Not a chance. After tuning the mount to it's utmost, I still get 5 seconds of wibbletivity when my bifocals brush the eyecup.
    Definitely NOT suitable for astrophotography.

    Soooooo.....I have approached All Star Telescopes in Alberta about laying one of these away for me, to be paid for over the next few months out of petty cash.

    The EQ2, aside from opening up a substantial negative revenue stream, (You were right, MarkM) has brought me to a much fuller understanding of the intracacies of the GEM, and will be a perfect mount for the Galillioscope, when it finally arrives. I know it is pretty extreme overkill, but it seems overkill is never a bad thing when it comes to telescope mounts.

    By now you are probably wondering, "Where is the question?????"

    More preamble.........sorry.........

    I have determined that polar alignment, at least the method I have worked out, and absent a polar scope, requires the OTA to be exactly parallel to the polar axis, like telescopes are always pictured in ads. There is no provision for this on my mount, so I can only eyeball the alignment.

    Here is the question: Do better mounts in general, and the CG-5 in particular, have detents in the mechanism to allow this alignment? I am definitely going to opt for the polar scope, but the question stands.
    Last edited by WWPierre; 02-21-2010 at 09:44 PM. Reason: Misspelt "wibbletivity" :)
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  2. #2
    ghswen's Avatar
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    Default

    Peter,

    My SkyWatcher EQ5 pro (same mount as the CG 5) does not have "detents". You really wouldn't what that as sure enough the "non"-detent would be exactly in the middle of where you wanted the mount to be positioned. Polar alignment is something most folks have to "fiddle with" for a while to get things close. I just added a file in the "download" section (under helpful astronomy tools) of the forum the other day that will walk you through the polar finder scope setup process. I use some short cuts that eliminate a lot of the turning of rings and dials. (hate doing that stuff). Give it a read and let me know if it begins to make sense.
    Gordon
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  3. #3
    ghswen's Avatar
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    Default

    Oh Peter,

    By the way (I know you'll love hearing this!) I don't believe this mount comes with a power supply! Double check to make sure but be prepared to spend some more money!

    This hobby is a VERY BIG black hole for money....
    Gordon
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  4. #4
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    Default

    I hope I got the question right, you just adjust the altitude adj. t-bolts to get your polar axis alignment. Loosening one and tightening the other will change the angle.


    Mike
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    ED120 Refractor (fl=900mm - f/7.5) on an EQ5 mount, Zhumell Z-10
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  5. #5
    DigitalNinja's Avatar
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    Default

    Well now that your going for the CG-5 you may as well just go right for a CGEM rto future proof yourself :P

 

 

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