www.astrocafe.hk

Despite the recent dusty ground surface and severe air pollution, still try to see if deep sky Tadpoles could be imaged using Ha filter.

The image is noisy for only just 2 hrs exposure.

http://www.raymondtse-lawyer.com/astro/ ... tik490.htm

thanks for sharing, 你提醒我拍過這天區，但看到你的照片後我才發現自己沒花足夠時間在Ha上，LRGB都是拍得很夠的。

看來Raymond沒興趣在PTC等什麼地方打游資了

社長 寫:thanks for sharing, 你提醒我拍過這天區，但看到你的照片後我才發現自己沒花足夠時間在Ha上，LRGB都是拍得很夠的。

看來Raymond沒興趣在PTC等什麼地方打游資了

I also did have enough exposure for the tadpoles. I originally intended Sat night for 2 hrs more Ha frames (by autoguiding) after I set up the PierTech 2
but when I returned home, only the 1st 20 min exposure was guided correctly, while the other frames were ruined by heavy clouds to hide away the guide star.
Last night was cloudy again. Thus only 6 images of 20 min each (ie 2 hrs exposure) could be used.

Thus in HK, the imaging time is still very limited by cloud coverage and dust pollution. It would take at least 2-6 weeks waiting before an object imaging
in LRGBO3HaS2 could be completed.

My observatory site is just 6km NW of PTC and slightly darker than PTC by 0.5 visual magnitude.

For portable setup, I think the next trip would be Victoria, Australia while I would go during Lunar Chinese New Year 2014.

Raymond TSE 寫:Thus in HK, the imaging time is still very limited by cloud coverage and dust pollution. It would take at least 2-6 weeks waiting before an object imaging
in LRGBO3HaS2 could be completed.

從另一角度想，若沒有遙控天文台，這類作品根本無可能拍出來。

當然若你換上大光圈鏡，效率又會高些。