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elton
週三 20 4月, 2005 22:06
版面: 天文攝影 Astrophotography
主題: Over pushed Jupiter,IO almost transit,small earthquak(final)
回覆: 1
觀看: 1807

Tonight, with help of another helpful astrofarmer, I learnt calcuting the focal ratio of my jupiter pics taken on 2005/04/14. It was found at f/67!!! It is really something like 'Without big telescope, don't take big picture' (Astronomical version of 'without big head, don't wear big hat'. :oops: :o...
elton
週日 17 4月, 2005 11:49
版面: 天文活動消息 Astro Activity News
主題: 天 文 望 遠 鏡 製 作 課 程---5 月 12 日- 7 月 10 日
回覆: 103
觀看: 56622

Yesterday I submitted the form lar (Ms Choi said I could submit cheque/cash later). :-) Hopefully the application will be approved!
thanks
Elton
elton
週日 17 4月, 2005 10:56
版面: 廠製儀器 Factory Equipment
主題: 香港太空館 24"口徑 RC反射式天文望遠鏡
回覆: 3
觀看: 3685

Re: 香港太空館 24"口徑 RC反射式天文望遠鏡

The equatorial mount is huge!!!
I mistakenly thought the DEC body is the RA body!
:shock: :shock: :shock: :D
It looks completely tailor made.
elton
週六 16 4月, 2005 11:46
版面: 天文活動消息 Astro Activity News
主題: 天 文 望 遠 鏡 製 作 課 程---5 月 12 日- 7 月 10 日
回覆: 103
觀看: 56622

I heard similar thing before in star camp, but that possibly only some misunderstood situation happened more than 20 ~ 30 years ago. I think now, it is not possible lar. :-)
Subaru 寫:
XR250 寫:我都比人reject過
嚇, 乜會感嘅咩? :roll:
elton
週六 16 4月, 2005 00:26
版面: 天文攝影 Astrophotography
主題: True story of greedy over pushing - plain biscuit returned
回覆: 28
觀看: 7697

Re: True story of greedy over pushing - plain biscuit return

I see!!!
Thanks for this valuable info!!!

Subaru 寫:
Wah! 寫:對於不同seeing,光度或曝光時間, 個F值應該會有唔同.
我係講緊就算夠定夠光, 用f/40以上去oversample, detail都唔會有什麼改進.
elton
週六 16 4月, 2005 00:21
版面: 天文攝影 Astrophotography
主題: Over pushed Jupiter,IO almost transit,small earthquak(final)
回覆: 1
觀看: 1807

Over pushed Jupiter,IO almost transit,small earthquak(final)

Over pushed Jupiter, IO almost transit, with small earthquake (Final version) Image taken on 2005/04/14, 10pm (HKT) Nexstar 5 at alt-az mode Meade 2x barlow Steve Mogg extender 2 eyepiece projection adapter Toucam. Registax, PS processed 100%, 50%, short 50% animation. :D :D :D (Thanks for Wah! sugg...
elton
週五 15 4月, 2005 22:41
版面: 天文攝影 Astrophotography
主題: True story of greedy over pushing - plain biscuit returned
回覆: 28
觀看: 7697

Thanks Wah and Subaru. I am now decreasing both the contrast of the pics and gamma so the middle is not over. :-)
I have heard there is a software measuring the pixels across the planet, what is that software? I don't know what is the focal ratio of last night setup lar. :-)
thanks!
Elton :-)))
elton
週五 15 4月, 2005 14:09
版面: 天文攝影 Astrophotography
主題: True story of greedy over pushing - plain biscuit returned
回覆: 28
觀看: 7697

True story of greedy over pushing - plain biscuit returned

:D :D :D I think Last night I over pushed my 5 inches SCT, using 1 steve mogg extender, 1 eyepiece projection adapter, another eyepiece projection adapter for Toucam Jupiter planetary imaging. Look at the size of Jupiter in the stacked 640 x 480 frame in 100% (my god, I think I am way too greedy to ...
elton
週三 13 4月, 2005 09:57
版面: 天文活動消息 Astro Activity News
主題: 天 文 望 遠 鏡 製 作 課 程---5 月 12 日- 7 月 10 日
回覆: 103
觀看: 56622

I am considering to join the "天文望遠鏡製作課程" this week, hope it is not too late, however I don't have cheaque book, a.) Is there any other payment method we can apply for the admission ga? b.) Besides, during the practical, can my girlfriend come to "tam ben" occasionally? She wants to see me grind mirr...
elton
週二 12 4月, 2005 23:06
版面: 天文活動消息 Astro Activity News
主題: 天 文 望 遠 鏡 製 作 課 程---5 月 12 日- 7 月 10 日
回覆: 103
觀看: 56622

I want to join too, still hv the vacancy? Hopefully I am not too 超齡 lar. :-)
elton
週二 12 4月, 2005 21:16
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: The making of 30 in telescope - 10, #80 fine grinding over
回覆: 9
觀看: 8407

Very interesting news!!!!!! Now the centre thickness is around 9.5 mm thick, still some margin to change the upper/lower position of the workpiece/mirror to increase focal length? Or it is too thin already? By the way, yesterday I read Mr. Wong's 'blue book' (self make astronomical telescope), it sa...
elton
週六 09 4月, 2005 00:54
版面: 天文攝影 Astrophotography
主題: Jupiter Animation and pictures taken on 2005/04/06
回覆: 13
觀看: 7402

Thanks a lot for the comment. :) :)
elton
週五 08 4月, 2005 00:20
版面: 天文攝影 Astrophotography
主題: Jupiter Animation and pictures taken on 2005/04/06
回覆: 13
觀看: 7402

Jupiter Animation and pictures taken on 2005/04/06

Nexstar 5 (at alt-az mode) + 2x Meade barlow + Steve Mogg extension tube :-) http://www.hkastroforum.net/bbs/album_pic.php?pic_id=2744 http://www.hkastroforum.net/bbs/album_pic.php?pic_id=2745 http://www.hkastroforum.net/bbs/album_pic.php?pic_id=2746 http://www.hkastroforum.net/bbs/album_pic.php?pic...
elton
週日 20 3月, 2005 01:46
版面: 二手交易場 Second Hand Area
主題: Sell - Pentax MZ-5 (EISA/TIPA award edition) + Pentax 28-200
回覆: 7
觀看: 7654

All items sold. :-)
elton
週六 19 3月, 2005 10:50
版面: 天文攝影 Astrophotography
主題: 2 Widefield photos taken in Shui Hau at 2005/1/1
回覆: 7
觀看: 4004

Hi, SY Lok, hope adding the constellation lines would help. :-) b. rgds Elton http://www.astrofarm.net/dbphoto/loadimg.php?id=3638 Your photos are so nice. I haven't seen such beautiful sky in Hong Kong for a long time. Would you describe the sky in the first photo? I cannot recognise the stars. :sh...

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