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#1 midnightblue

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Posted 16 May 2009 - 02:03 PM

hi guys I've posted this in the beginner section put I'm
getting no joy I'm setting up the align polar scope
reticule for EQ6 pro I've lined up the cross hair to
faraway target the cross hairs stay on and does not
move off the target but the actual target is moving in a circular
motion would this indicate that the polar scope is not
in-line with the shaft if so how do i adjust the polar
scope to be in-line with the shaft

#2 LLEEGE

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Posted 16 May 2009 - 05:21 PM

Look under tech support on the Astro-physics.com page under the PASL3. It may give you some help on how to optically align yours.

#3 midnightblue

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Posted 16 May 2009 - 08:49 PM

this is what i see when i rotate the RA axis after following the instructions
step 2: aligning the polar scope reticule

blue is circular motion

yellow is the object i aligned the cross hair to

notice how both cross hair and object rotate around in a circle

should i be seeing this

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#4 midnightblue

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Posted 16 May 2009 - 08:53 PM

or this

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#5 LLEEGE

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Posted 16 May 2009 - 09:52 PM

The second.

#6 midnightblue

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Posted 16 May 2009 - 10:16 PM

any idea what could be the cause faulty polar scope faulty mount

:question:

#7 jrcrilly

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Posted 16 May 2009 - 10:18 PM

any idea what could be the cause faulty polar scope faulty mount

:question:


The PAS isn't aligned to the mount.

#8 midnightblue

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Posted 16 May 2009 - 10:41 PM

how do i align the P A S to the mount or would it need to be sent back to the manufacture :question:

#9 jrcrilly

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Posted 16 May 2009 - 10:52 PM

how do i align the P A S to the mount or would it need to be sent back to the manufacture :question:


Should be on page 13 of this manual.

#10 midnightblue

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Posted 17 May 2009 - 05:24 AM



i have followed instructions on part 13 part 12 in my manual

put no where on part 13 does it say the target and reticule

should or should not move around in fixed circular motion

the reticule cross hair don't move of the target BUT the

target and cross hair is moving around in a circular motion

and not at a fixed central point could someone with a eq6

test to see if the cross hair follow the target around in a

circular motion or does the target and cross hair stay

central at a fixed location thanks

it seems I'm going around in a circle and no one knows the

answer and keep sending me back to page 12

#11 John Carruthers

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Posted 17 May 2009 - 05:27 AM

Have you tried this guide?

#12 Charlie Hein

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Posted 17 May 2009 - 05:52 AM

This image shows the alignment is off:

Posted Image

...and this one shows the alignment is on:

Posted Image

What you seem to be describing is a scenario where the star stays centered under the center cross hair but the whole view seems to move...

I've lined up the cross hair to faraway target the cross hairs stay on and does not move off the target but the actual target is moving in a circular motion


I believe this can happen if the reticle is out of square with the optical elements of the polar scope. I've seen this on a couple of these polar scopes and while it looks bad my experience on this is that it is actually aligned okay and will even work well enough for imaging. The reason I'm suggesting that it's an out of square reticle is that we've resolved a couple of them by loosening the reticle enough so that it moves freely and tapped the polar scope "eyepiece up" to drop the reticle all the way down in its slot and this has sometimes remedied the situation.

#13 midnightblue

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Posted 17 May 2009 - 06:57 AM

i removed the reticule from the polar scope
its the projected image object through the polar scope
is moving in an arc have no problem with lining the
reticule with an object and keeping the cross hairs on the
object but both the object and cross are then moving in an
arc would this indicate a serious problem of the polar scope
is not seated true in the mount

#14 midnightblue

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Posted 17 May 2009 - 08:09 AM

update i have sorted the problem out i had a member from

my local club to have a look and he tried his polar scope

from his EQ6 PRO in my mount and after aligning the

reticule to the same object there was no rotation arc of

the object and cross hair he seem to think that it could

be the optics are not align or the barrel that holds the

bottom optic may not be true thanks every one for helping

i now know its the polar scope and not user error

#15 robjohn

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Posted 17 May 2009 - 08:44 AM

You say that you are lining up the polar scope on a "faraway object". It does not sound as if you are using a star, but some terrestrial object. What object are you targeting and how far away is it?

You say that the "actual target" is moving in a circular motion. What is the actual target? Are you talking about the same object when viewed through the telescope or another object when viewed through the polar scope?

What is the period of the circular motion?

#16 robjohn

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Posted 17 May 2009 - 08:56 AM

Never mind. I see that you have isolated your problem.

Clear, calm, and dark skies.

#17 Charlie Hein

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Posted 18 May 2009 - 06:20 AM

he seem to think that it could be the optics are not align or the barrel that holds the bottom optic may not be true thanks every one for helping i now know its the polar scope and not user error


If you've already determined that the reticle is square to the rest of the optical path then another thing that you might check is that the "objective" end of the polar scope is well secured. You can see from the image below that this end of the polar scope is far more likely to be out of true then the "eyepiece" end because of the way that it is constructed. If the retaining nut (labeled "focus lock nut" in the image below) is loose then the whole objective end of the polar scope can easily shift position. You'll want to take your best shot at squaring this up as there's no quantitative means of doing this that I know of. You'll need to finalize this procedure by tightening the retaining nut against the tube that holds the objective lens.

Posted Image
(click the image to read an old post on the polar scope reticle)

That said, it bears repeating that while there's certainly nothing wrong with spending some time trying to fix this, it has been my experience that even when the view "wobbles" in this way your polar alignments will be good enough for guided imaging and certainly more than good enough for visual work.

#18 huckabuck

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Posted 18 May 2009 - 07:17 AM

hello mnb,
remove (unscrew) the eyepiece and check that the etched glass inside has not slipped. if the alignment screws have been backed out too much at one time or another the glass with the etchings will slip. if that is the case, back the set screws out and replace the glass piece in the center and adjust the set screw so that it is close to centered. when you adjust the alignment you need to loosen the set screws less than 1/4 turn at a time or it will come apart again.

#19 midnightblue

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Posted 18 May 2009 - 11:42 AM

charlie i think it maybe the barrel when i screw the barrel
all the way in i don't get no rotation arc of the object
it stays fixed but then i cant see the marking on the
reticule its only when the barrel is unscrewed half way
the object starts to rotate with and without the reticule
in its Defoe the barrel and not the reticule that's
causing the problem its as if the objective end is of
centre

#20 Charlie Hein

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Posted 18 May 2009 - 11:57 AM

charlie i think it maybe the barrel when i screw the barrel
all the way in i don't get no rotation arc of the object
it stays fixed but then i cant see the marking on the
reticule its only when the barrel is unscrewed half way
the object starts to rotate with and without the reticule
in its Defoe the barrel and not the reticule that's
causing the problem its as if the objective end is of
centre


Yes, that would be my guess as well. The trick here is to unscrew the barrel until the polar scope is focused, then tighten the "main focus lock nut" as tight as you comfortably can against the piece of the polar scope that actually screws into the mount. The "main focus lock nut" nut is the knurled ring that's threaded onto the objective barrel - check the image above for how these parts go together.

You may still need to "flex" the objective barrel a bit to line it up but if the nut is sufficiently tight it should hold where you put it. It will just "flop" under gravity if the nut is not tight enough.

#21 midnightblue

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Posted 18 May 2009 - 12:55 PM

Ive also put P.T.F tape on the barrel and the main thread of
the polar scope :yay: its a BIG improvement only a slight
arc nothing like before and like you said a slight wobble
should be fine now its just a matter of waiting for the
weather to clear
thanks for your help charlie appreciate it

#22 Charlie Hein

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Posted 18 May 2009 - 01:05 PM

It is my pleasure - as I mentioned I used to own an Atlas/EQ6 for several years until just recently and now a number of my fellow club members have them too - we get a lot of experience with the mount.

#23 Charlie Hein

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Posted 19 May 2009 - 06:49 AM

BTW - good idea using the teflon tape - that should snug up those loose threads quite a bit!






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