測試道具: SkyWatcher HEQ5 pro, Celestron NexGuide Autoguider+ 60220導星鏡, SkyWatcher ED80/600+ Kenko X 2 加倍鏡，Canon 7D + CLS FF filter + ISO1600
這幾樣道具其實老早都在手上，但是沒有合體測試過，眼見昨夜的天空那麼亮，很多不利條件存在，月齡14幾乎把天空照亮，視星等連北極星都看不到之下，這幾樣在天文攝影不算好的設備到底能夠發揮到如何呢?
尤其加上兩倍鏡的狀況下，赤道儀會不會拖線很大?
說實在的在測試前真的非常沒有把握!
以下這張是35分鐘的測試結果，每張只用75秒的時間，共28張疊合。因為沒有用這麼長的焦段架上赤道儀拍攝過，
所以沒有把時間拉長到更長，加上冬季的風不是穩定的吹，所以就保守點，等下次再看看更長的時間囉!
不過說實在，600 x 2(1200mm)如果加上APSC x 1.6 等同焦距是 1920mm 結果暫時讓我滿意囉!
沒想到的是，M42星雲用這樣的焦段竟然剛好把M42放到APSC的整個畫面而已...
English:
Equipments: SkyWatcher HEQ5 pro, Celestron NexGuide Autoguider+60x220mm guiding telescope, SkyWatcher ED80/600mm+ Kenko X 2 Len，Canon 7D + CLS FF filter
Reason to make this test:
1. I would like to know what is the limitation on these equipment that I have. I never put them together to take astro photo.
2. Last night moon age is day 14. Night sky was so brightness, I would like to know whether NexGuide Autoguider is still functional as normal.
3. These equipments are not the best equipment in Astro-graphic field, I try to convince myself not to buy new equipment which are very high price in market.
From the result 75 seconds x 28 frames ISO1600 on M42 nebula, I am happy with the results. Total 28 frames without trails on stars. Due to winter time in Taiwan always with unstable wing speed, only tested 75 seconds to prevent too many fail tracking result. Next time will try to test it in Spring time here for longer time period on tracking.
I am so surprise 600x2(1200mm) shooting M42 nebula can fit on APSC Canon 7D. I though it will over the CMOS size.
