如果有多的極軸望遠鏡直接鎖在上面是不是也是個解決辦法呢?
當然可以
但是要如何調整與軸管平可能要思考一下喔
山水兄也許有好點子
之前有買一隻小支的尋星鏡
原本也打算拿來當極望 現在還在想怎麼裝才能準確
參考依下這裡
轉載自Classic Astrophotography - Photographing the Cosmos with ordinary film.htm
POLAR ALIGNMENT
The #1 cause of tracking error with this mount is poor alignment to the Celestial Pole. In order for your mount to compensate for the Earth's rotation, you need to make sure your tracker is precisely aligned with the celestial pole.
So how do you find the exact pole? Fortunately for those who live in the Northern Hemisphere, it is very close to the North Star - Polaris. Polaris is fairly bright star that makes up the last star in the handle of the Little Dipper – Ursa Minor- as we discussed in the tracking alignment section above.
Once you locate Polaris, point the hinge axis directly at it.
This will put you very close to the Celestial Pole, but not close enough for our use. Now you must make one final adjustment to get the accuracy needed for long exposure astrophotography.
The North Celestial Pole is located ? of a degree away from Polaris, which is a very tiny amount. The full moon is 1/2 a degree across, so you need to adjust your mount by slightly more than the diameter of the moon. But which way do you move the mount? This is also very easy!
The north Celestial Pole lies 3/4 of a degree away from Polaris in the direction of the bright star Kochab, or Beta Ursa Minor is.
You simply point the mount at Polaris, and then shift it slightly (3/4 of a degree) towards Kochab. Now you will be VERY closely aligned with the Celestial Pole, and your mount will track very accurately!
You can add a very small telescope (finder scope or gun scope) to help you locate the exact celestial pole to increase accuracy. The closer you get to perfect alignment with the pole, the longer you can expose before the trailing or blurring will occur.
In this photo I have attached a simple 6X finderscope from a commercial telescope to the top board. This allows you to get very accurate Polar Alignment vs. what you can get only using your eyes.
You should first look at the moon in order to learn what 3/4 of a degree looks like. Remember, the moon is 1/2 degree across, so once you see what 1/2 a degree looks like, you can easily see what an additional 1/4 of a degree would be.
To use a finderscope, it is absolutely essential that the finderscope is perfectly aligned with the HINGE . It will be much easier if you do this in daylight. First, secure the tracker on a tripod and then sight on a distant object in the finder, such as a telephone pole or church steeple, while looking through the finderscope, rotate the top board as far as you can. You should see the sighted object simply rotate in the field of view. If, however, the object swings out of view, then the finder must be carefully moved to improve the alignment. Keep repeating these steps until the object simply rotates around the center of the finder, and you will have it aligned perfectly with the hinge.
To keep cost down, many astrophotographers use a simple straw or small pipe to sight through. I have seen one tracker sight through the hinge itself, by simply removing the hinge pin during alignment!
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