名位趕著用較剪腳的同好注意，較剪腳跟來的電源線是 12V 汽車插頭(見圖)，可能你地要準備定適合自己用的電線。
還有，要好好發揮較剪腳的實力，一定要對準極，但較剪腳的極軸鏡內的 reticle 多數和極軸鏡的optical axis 並未校準(我支就有1-2度偏差:icon_fire )，所以使用前請小心調教。
調教方法: http://astrograph.wordpress.com/ ... otrack-polar-scope/
或上 astrotrac 的 yahoo group 尋找。
以下文字是從 astrotrac 的 yahoo group 抄過來給大家參考，yahoo group 還有好多 astrotrac 的討論，對名位用家好有用的。
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PA Scope Reticle Alignment (Message #2581 of 2879)
Hey to all,
Well, this subject hasn't been mentioned in some time, so perhaps it should be
resurrected.
The reason I do so is because I discovered from researching the cause of star
trailing that it was the PA scope's fault. The off-center reticle was the cause
of star trailing in some 2-min. images made after a 2-star PA of the AT.
It makes NO difference how good your polar alignment is IF the reticle "cross
hairs" are not in the optical axis of the PA scope.
The procedure for this has been cussed and discussed previously.
The process I employ is:
1. set up AT as if you were going to track.
2. Two things to do before you insert the PA scope:
a) make sure the reticle is focused by turning the EP in its
threads.
b) make sure the PA is focused by sighting on an distant
object. If it isn't clear, then loosen the single set screw
(1.5mm) on the objective's side of the silver ring, turn the
TUBE until the distant object is in focus, then reset the set
screw.
If one does "b)" the reticle will probably need realignment anyway.
3. Affix the PA scope holder in one position. USE THIS SAME POSITION FOR ALL
FOLLOWING ADJUSTMENTS.
4. Insert the PA scope and move the illuminator to the 12 o'clock position.
5. Using the mount's controls, center the reticle's "X"
6. Note there are 3 set screws (1.5mm) on the EP side of the silver ring.
These are the screws used to center the reticle's "X" DO NOT OVERTIGHTEN ANY OF
THESE UNLESS YOU WISH TO CRACK THE RETICLE!!!!!!
7. Move the illuminator to 6 o'clock and note the offset of the "X" from the
object. Loosen the set screw(s) on the side to which the reticle needs to be
moved before firming down the other(s). Try to move the "X" about 1/2 way of
the distance it needs correcting.
8. Place the illuminator back at 12 o'clock and repeat the centering process,
then back to 6, then back to 12, etc., etc., until the reticle's "X" is centered
when the illuminator is at 12 and at 6.
I'll repeat: DO NOT OVERTIGHTEN THE SET SCREWS. YOU WILL BREAK THE RETICLE IF
YOU DO SO. Also, ALWAYS, FIRST LOOSEN THE SET SCREW(S) THAT ARE ON THE SIDE TO
WHICH YOU NEED TO MOVE THE "X."
Some folks stop here. I go tediously on to doing the same thing at the 3
o'clock and 9 o'clock positions until the distant object is centered in all 4
quadrants to the best of my ability to do so.
9. There is an alternative I do when using the 4-quadrant alignment. That is,
always center the "X" using the mount's controls when the illuminator is in the
12 o'clock position. Then adjust the other 3, reset 12, and repeat.
This process, to be done correctly, takes time, effort, and concentration. If
you feel yourself getting frustrated, stop, and resume after a break.
It took me an hour to realign the reticle in my PA scope!! It's as close to
perfect as I can align it in 3 quadrants and pretty darn close in the 4th. So,
it CAN be done, but it ain't easy.
However, if the reticle's "X" isn't centered, then the image will suffer the
consequences.
Good luck and better skies,
Perry
[ 本帖最後由 kst 於 2010-8-1 21:28 編輯 ] |
發表於 2010-8-1 21:25
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