香港天文論壇

wtyu21 寫:

sodium 寫:

wtyu21 寫:

anyone 寫:tonight no mosquitoes and very cool and dry !

溫爺今晚PTC有幾多人啊？又有邊幾位呢？ 我今晚石澳要同哎呀女友一齊所以無得來PTC～

你係唔係十一點半左右走?

Yes ar~我地走時仲望下平台仔上有位師兄係度攝緊星，都怕且係你啦～你好～

我係冇燈果面平台仔試緊tp1 你好~

wtyu21 寫:

anyone 寫:tonight no mosquitoes and very cool and dry !

溫爺今晚PTC有幾多人啊？又有邊幾位呢？ 我今晚石澳要同哎呀女友一齊所以無得來PTC～

你係唔係十一點半左右走?

mwtse 寫:正常彩虹紅色在外圈。

假設是午後拍攝，太陽在西邊下山，即照片的右邊（從一些大厦的反光可以印證），所以紅色在近太陽那一邊，即內圈，似乎樓主是拍攝到較少見的雙彩虹的外虹。

應該是sun dog吧?

不是有人說過在天文論壇不講政治；不給有心人在此抽水嗎？ :? I understand the point (of the first part). but this is very sad if we can't even discuss an ACCIDENT. This is certainly MORE than an "accident" Maybe you may hurt someone or make them very upset when they know how the rescue is ..... http://www.youtube.com/watch?v=Po...

Nosneb 寫:可以將相機頸帶掛上尋星鏡座, 萬一相機真係滑出來都仲頂到下.

如果SCT(C 8 )->T-thread->EF
只要小心應該冇機會滑出來?

saw it at Tai Po too,
there were lots of people taking pictures lol

其他人人都有靚靚調色盤, 我沒有L鏡, 只得支老鏡135mm, 且是日本雜嘜, 不是德國名牌 :cry: 勉強一試, 但不知怎樣調色才好, 仍不滿意, 但越調越亂, 暫時先出這幅。 Cosinon 135mm f/2.8 @ f/4, Canon 450D (w Baader filter), ISO1600, AstroTrac TT320X-AG 200s X 21 (1hr 10min), Dark and Bias calibrated, DSS + PS + Topaz Denoise5 & Detail2. Cosina 都雜嘜?? :? 佢代工MIJ既Zeiss同Voigtla...

「大亞灣民間監察會」正式成立 獨立質詢 聯手監察核安全 http://www.greenpeace.org/hk/press/releases/climate-energy/2011/03/daya-bay-monitoring/ 大亞灣現時受那個地區管制﹖中央﹖香港﹖如果受中央管，中央已經有足夠核專家監察，冇須呢D民間組織，因為佢地對核智識一知半解，冇乜用。 http://www.hket.com/eti/article/f97c6ee8-aa14-4638-93b7-c4076fc6e076-908696 一號機組在1987年興建期間，竟可以發生漏放317條鋼筋的荒謬工業醜聞。 中央監察...

chun_honghk 寫:

sodium 寫:

vegabort 寫:九十年代的冬天我在西貢海下、大浪西灣、大浪灣露營時都見過螢光浪...不過都是螢光綠，未見過藍色的....

早前在香港看見,看起來是綠色的,拍照時是藍色的....

sodium兄, 呢排仲有無得睇? 我都想去影

俊康兄 (lol)
呢幾日冇咩留意
最快要星期三先可以去睇,如果當日見到call你啦

vegabort 寫:九十年代的冬天我在西貢海下、大浪西灣、大浪灣露營時都見過螢光浪...不過都是螢光綠，未見過藍色的....

早前在香港看見,看起來是綠色的,拍照時是藍色的....

KingArthur 寫:it's a good shoot, anymore? How long is the image exposed?

Tv( Shutter Speed ) 1.6s
Av( Aperture Value ) 4.0
ISO Speed 3200
Focal Length 17.0mm

It's already my best shot, the other trials with longer exposure time with low iso didn't give dynamic of the luminescence [被咬了]

在海邊看見的東西

鄧登凳 寫:Canon DSLR 較易可以更換感光器前的紅外線濾鏡。
原廠濾鏡會降低相機對紅色星雲(H-alpha和S-II)的敏感度。

450D是入門機有Live View的起步點, Live View對取景和對焦等都很有用。
較新的500D和550D較貴, 也多數是在原廠保養期內, 多數人不願意改機而失去保養。

also 450D cheaper in 2nd hand market, and much lighter than X0D to reduce the loading of mount?

真的可以和幾年前和太空館合作的"網上遙控天文台計劃"的創舉....................比美了。 Dear Carl, What was it about the "remote observatory scheme" ? I hardly found any information about it . Best regards Chan Yuk Lun http://app.hkatvnews.com/v3/oldcontent.php?date=2008-11-13&news_id=123313 I guess he is talking about this :evil:

i preferred to 1000d for it's price, but after reading that test result, although I don't understand what it's describing, seems 500D is much better judging from those photos. I heard that noise is ~ proportional to the pixel size, (1000d and older models got larger pixel size), but why there are a...