Announcements and News
Cloudy Nights Announcements
Discussion of CN Articles, Reviews, and Reports
General Observing and Astronomy
ATM, Optics and DIY Forum
Cats & Casses
Video and Electronically Assisted Astronomy
Astrophotography and Sketching
Beginning and Intermediate Imaging
DSLR & Digital Camera Astro Imaging & Processing
CCD Imaging & Processing
Solar System Imaging & Processing
Astro Imaging/Sketching Contest
Solar System Observing
Deep Sky Observing
Double Star Observing
Solar Observing and Imaging
Variable Star Observing and Radio Astronomy
Telescope Specific Forums
Celestron NexStar, NexStar GPS, CPC
Astronomy Shows & Conferences
Astro Art, Websites & Other Media
Astronomy Clubs and Star Parties
Astronomy Software & Computers
Books, Star Charts & Stellar Media
Science! Astronomy & Space Exploration, and Others
The Off Topic Observatory
Off Topic Observatory Games
Cloudy Days & Microscopes
Cameras & Photography
Swap and Shop
S&S Misc Astro
S&S Information for New Members
CN Feedback and Vendor Announcements
Vendor and Group Announcements
International Year of Astronomy 2009 - Forums are now closed.
IYA Archive Info
Articles and Columns
/ Fine tuning Tak EM200
Fine tuning Tak EM200
July 7, 2009 3:09 PM
I recently aquired a tak EM200 from a member of my local group.
Two things I noticed:
1) On the altitude lockdown, it doesn't matter how much I tighten the lever, the mount will still move up and down (as seen in the polar scope) when I turn the altitude adjustment key. Is this normal?
2) On azimuth, sometimes when doing a precision polar alignment, (using WCS alignment software), the star shifts to the west as I begin move in that direction, then as I continue to turn azimuth knob, the image begins to go back in the correct direction. Also I noticed there are little indentations on the azimuth peg on the tripod (I am assuming these are from tighting the azimuth screws). Should I loosen the azimuth peg, and rotate it 90 deg or should I leave wellenough alone? (although the "southern" post hole on the tripod is completly round it is doesn't look like there is a way to set the peg perfectly "square" with the northern leg of the tripod.
last thing. Once I get azimuth precisly polar aligned, should tighten both azimnuth knobs against the post, or leave a litte gap and just tighten the mounting bolt (underneath tripod)?
GoTo_Dobs (Yahoo Groups)
Orion XT10G, Tak EM200, SV ED102, WO Z66ED Canon 550 (T2i) w/ Orion's Skyglow Imaging & , DSI-2 for guiding, 25x100 Burgess & homemade P-mount
July 7, 2009 3:29 PM
I've used an Em-200 for a couple of years now. I think your mount is acting normally. I would leave well enough alone. I don't know anything about the precision software you are using. I am just a lunar/planetary person and the basic Tak alignment procedure has always been enough for me.
The moon speaks Octave...
July 7, 2009 5:04 PM
I think that the lock down mechanism is more of a clutch than a hard lock system, so like you, I can also adjust the altitude despite the lock down being fully applied.
July 7, 2009 9:41 PM
Once you get the az aligned I would tighten both bolts down. I actually tighten the main (underneath) mounting bolt first now because I find everything shifts if I don't, I'm not having any issues with that. As Dennis said the alt knob is a clutch. Most of the fine adjustments can be done with the lockdowns and knobs all tightened.
Johnny FS152 15" Obsession Classic w/ 14.5" f/4.65 Zambuto
July 7, 2009 11:40 PM
I never tightened anything but the clutches on my 200 or 400.
Work fine for 30 minute exposures for me.
Can't help you with WCS since I use PAM, but not all the time.
John Find it:
A bunch of atlases
/ Fine tuning Tak EM200
Back To Top
Like This Topic
Blue & Grey
Remove This Ad
CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.
I don't want no stinking ads, but I want to help Cloudy Nights!!!!