what !! 4200 USDwillis 寫:The Tak Epsilon 180 is an ultra fast DSI weapon! It is F2.8!!!syyuen168 寫:星點Tack Sharp. 350D都有咁效果. 高橋鏡就是不一樣![[Good Job]](./images/smilies/onion_d5f02ecd.gif "Good Job")
http://www.optcorp.com/ProductList.aspx ... 00-605-918
M42, M45 & Rosette Nebula （图片更新）
It is a very fast scope. We are talking f.2,8 here 
MANDII 寫:what !! 4200 USDwillis 寫:The Tak Epsilon 180 is an ultra fast DSI weapon! It is F2.8!!!syyuen168 寫:星點Tack Sharp. 350D都有咁效果. 高橋鏡就是不一樣
http://www.optcorp.com/ProductList.aspx ... 00-605-918
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KingArthur
- 夸克星
- 文章: 2398
- 註冊時間: 週四 14 8月, 2003 17:50
- 來自: Lantau
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universe24
- 中子星
- 文章: 1930
- 註冊時間: 週五 11 7月, 2003 20:11
- 來自: Malaysia
Dear KingArthur, I would say that these are just introduction and preliminary results from my try on the E180 performance. I do wish to photograph other tough DSOs. Somehow, during the 3 nights observation, only one night manage to get some shots. Don't worry, after I finish my project on those bright and easy DSOs using the E180, the next step will be those faint and interesting tough DSOs.
Smaller f value, mean that we can spend shorter time to gain good signal from the object we wanna capture. This can avoid several problems from doing long exposure such as the seeing condition and equipments errors...maybe tracking...and it also save time, so that we can capture more objects in one night.
Smaller f value, mean that we can spend shorter time to gain good signal from the object we wanna capture. This can avoid several problems from doing long exposure such as the seeing condition and equipments errors...maybe tracking...and it also save time, so that we can capture more objects in one night.
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universe24
- 中子星
- 文章: 1930
- 註冊時間: 週五 11 7月, 2003 20:11
- 來自: Malaysia
The observatory located at Langkawi Island. The most northern part of West Malaysia. The island is one of the famous tourism place in Malaysia.BossKwan 寫:Beautiful photos, well done!
I guess the site where you took these photos are fairly dark.
Where is Langkawi National Observatory located? Is it near the city Kuala Lumpur? And what is equipped with this observatory?
It is about 500km north of Kuala Lumpur.
There got two dome at the observatory. One is stellar dome equipped with RCOS 20" + paramount ME. Another dome is solar dome equipped with two TMB152APO refractor for solar observation in white light and H-alpha.
According to recent research paper about the limiting magnitude of the observatory's sky, the sky brightness is at level of 18th mag. at the zenith.
There are light pollution around up to 30 degrees above horizon.
Not a very dark side but winter milky way still visible by naked eye.
To MOON TO: 同哈勃比，螳臂当车...
昇仔：人肉导星太吃力了...
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