有 77 筆資料符合您搜尋的條件

johnsonlau
週三 09 8月, 2017 11:45
版面: 廠製儀器 Factory Equipment
主題: 可在哪買到A4 size黑色太陽filter?
回覆: 1
觀看: 626

可在哪買到A4 size黑色太陽filter?

下星期出發到美國,請問可在哪買到約A4 size的膠質黑色太陽filter? 謝謝
johnsonlau
週五 02 11月, 2012 00:58
版面: 太陽觀測和攝影 Solar Observation & Photography
主題: 買巴德膜ND3.8
回覆: 1
觀看: 1346

買巴德膜ND3.8

日全食用. 我原有的好像有穿孔的情況, 安全點還是買新的好. 請問在哪裏可以買到?
johnsonlau
週五 02 11月, 2012 00:54
版面: GRUS 天文社
主題: 最新款铝合金巴德膜盖子
回覆: 88
觀看: 34458

我要120mm的, 必須在11月7日前送到香港, 可以嗎?
johnsonlau
週一 17 9月, 2012 23:26
版面: 天文話題 Everything about Astronomy
主題: 2012 澳洲日全食
回覆: 26
觀看: 20243

我會在10Nov至15Nov在Cairns停留, 有興趣聯系者可email j@ij.hk
johnsonlau
週四 14 6月, 2012 13:29
版面: 天文話題 Everything about Astronomy
主題: 2012 澳洲日全食
回覆: 26
觀看: 20243

我已經訂好機票, 10 Nov 到Cairns. 有興趣到時一齊睇的請保持聯絡.

Qantas 6月19日前有特價, 賣得好快! http://www.qantas.com.au/
johnsonlau
週三 06 6月, 2012 21:32
版面: 太陽觀測和攝影 Solar Observation & Photography
主題: We all saw it, it's real - the Black Drop Effect (with pic)
回覆: 72
觀看: 18694

Re: We all saw it, it's real - the Black Drop Effect (with p

For the 03.jpg, edge of the Sun is blurred. I wounder if it is simply 1. bad focusing, 2. bad seeing, or 3. vibration. From the double edge of the sun, I suspect it is vibration. Dears, We have prepared but did not expect to observe the black drop effect today. It really happened. At about 10 minute...
johnsonlau
週三 06 6月, 2012 18:11
版面: 太陽觀測和攝影 Solar Observation & Photography
主題: We all saw it, it's real - the Black Drop Effect (with pic)
回覆: 72
觀看: 18694

Sorry! my telescope is 80mm, not 70mm. That's why I can't capture blackdrop effect? The same settings at 6sec before 3rd contract (12:31:18pm) 1/8000s ISO100 Again, no obvious blackdrop effect. This is taken at Star Avenue, about 9sec after 2nd contact. I don't think there is obvious black drop effe...
johnsonlau
週三 06 6月, 2012 16:12
版面: 太陽觀測和攝影 Solar Observation & Photography
主題: We all saw it, it's real - the Black Drop Effect (with pic)
回覆: 72
觀看: 18694

The same settings at 6sec before 3rd contract (12:31:18pm) 1/8000s ISO100 Again, no obvious blackdrop effect. This is taken at Star Avenue, about 9sec after 2nd contact. I don't think there is obvious black drop effect. I took a series of pictures around 2nd contact at a rate of about 1.5Hz. Details...
johnsonlau
週三 06 6月, 2012 16:01
版面: 太陽觀測和攝影 Solar Observation & Photography
主題: We all saw it, it's real - the Black Drop Effect (with pic)
回覆: 72
觀看: 18694

This is taken at Star Avenue, about 9sec after 2nd contact. I don't think there is obvious black drop effect. I took a series of pictures around 2nd contact at a rate of about 1.5Hz. Details: Time: 6:29:46am Skyrover 70ED (d=70mm, focal length=560mm) Canon 30D 1/1000s ISO 250 Raw -> Jpg, 200%crop, w...
johnsonlau
週五 09 12月, 2011 11:54
版面: 天文攝影 Astrophotography
主題: 東壩冬季銀河
回覆: 12
觀看: 3093

有希望在月全食時看到銀河嗎?
johnsonlau
週三 07 12月, 2011 22:55
版面: 談天說地 Chatting Square
主題: 你會撐佢嗎?
回覆: 16
觀看: 3672

關你(我)乜事? 你(我)有票咩?
johnsonlau
週三 07 12月, 2011 10:25
版面: 談天說地 Chatting Square
主題: PTC 好凍呀
回覆: 14
觀看: 3403

MOON TO 寫:
johnsonlau 寫:你地成日講的PTC, 可唔可以在google map上指出確實位置? Thanks!
你在西貢碼頭坐小巴,在北潭涌巴士站落車,落左車見到個巴士站向左手邊行十幾步會見到一個空地。
係哩個停車場嗎? http://g.co/maps/s5h4u

同天文公園/東壩相比, 觀星條件如何? 可以見到銀河嗎? 我希望在月全食其間可有機會見到銀河 (當然還要看天氣)
johnsonlau
週三 07 12月, 2011 02:06
版面: 天文話題 Everything about Astronomy
主題: 請問前往東壩交通如何前往?
回覆: 6
觀看: 5603

半夜要在東壩出來, call的士會否很困難?
johnsonlau
週三 07 12月, 2011 02:04
版面: 談天說地 Chatting Square
主題: PTC 好凍呀
回覆: 14
觀看: 3403

你地成日講的PTC, 可唔可以在google map上指出確實位置? Thanks!
johnsonlau
週一 05 12月, 2011 19:11
版面: 天文話題 Everything about Astronomy
主題: 月全食觀測地點
回覆: 4
觀看: 2918

月全食觀測地點

觀測月全食, 是否有必要盡量遠離光害? 在全食其間光害會有很大影響嗎? 有人打算去水口籮箕灣或石澳嗎? 在月食當晚應有很多人到那些地點觀測, 應該不怕治安問題吧?

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