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tommy_tse
週一 16 7月, 2007 19:26
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
回覆: 127
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

May I present to you the pictures of yesterday showing the sequence of events.

1. Our mirrors were graded by Wong Sir

All of us were lining up to receive our coated mirrors back from China. The highest score given was 97 out of 100. 2 students tied at 97.
tommy_tse
週一 02 7月, 2007 22:30
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

光柵

Seeing by naked eyes through 光柵 is still the same - straight lines, no curving lines.

I tried using my DSLR to take a picture of it. Manual focus was still difficult. My focal length of the mirror is 650 mm (f/5.4167).
tommy_tse
週一 02 7月, 2007 22:15
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
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拋物線化

I have spent about 30 minutes in total to do the 拋物線化. I still cannot see the curving lines (f/5) as shown in Wong Sir's notes.

I took some images of the 光柵 and still do not show up correctly. I am afarid that if I continue with more time, I may introduce problems; so I stop.
tommy_tse
週一 02 7月, 2007 21:49
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

Digital Camaera Focusing

Wah!

My small digital camera cannot be manually focused.

Tommy
tommy_tse
週一 02 7月, 2007 12:49
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

Konchi Test Setup (Modified)

The setup had the light source and the slide on the same plane.
tommy_tse
週一 02 7月, 2007 12:04
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
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Taking Konchi Test Image Again

I took another image of the Konchi Test Image last night on the same mirror without further polishing. It is still 5 hours of polishing in total. The setup has now changed with the light source and the slide on the same plane. The position of the light source was at 1280 mm. The focal length is 640 ...
tommy_tse
週日 01 7月, 2007 23:43
版面: 天文攝影 Astrophotography
主題: 21-6-07木星
回覆: 22
觀看: 10837

Registax Problem

I had a Jupiter avi video from ToUcam which contained 2500 (250 seconds of 10 fps) frames. It was to big to be processed by Registax. It can take up to 2300 frames. How can I cut the avi into 4 x 60 seconds short movies to be porocessed by Registax? I try using frame list function in Registax but it...
tommy_tse
週日 01 7月, 2007 02:08
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

Konchi Test

After a total of 5 hours of final polishing over the last few days (1 hour at Space Museum; 1 hour on Wednesday 27/6; 1 hour on Friday 29/6, 2 hours on Saturday 30/6), I am ready to conclude that I have finished making the mirror. Please look at my Ronchi Test Image and see if I can stop here. It is...
tommy_tse
週六 30 6月, 2007 03:32
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

I truly enjoy and treasure the time we were together many times watching stars and hand guiding the mount over 25 years ago.

Without our experience together at Sky Observers' Club, I won't be talking in this forum.
tommy_tse
週六 30 6月, 2007 03:08
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: Final Polishing at Home (Finished)
回覆: 24
觀看: 18828

Final Polishing at Home (Finished)

You can see my family is all excited about amateur telescope making!
tommy_tse
週四 28 6月, 2007 22:12
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 光柵像,有些問題...
回覆: 15
觀看: 8962

我似乎沒有向蔡Sir拿取在上星期日實習課所派之兩張光柵像的notes.
請問那一位朋友可以電郵給我?
tommy_tse
週二 26 6月, 2007 18:51
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
回覆: 26
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天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007

Layanata continued to work on 6" mirror at the polishing stage using rouge mixture.
tommy_tse
週二 26 6月, 2007 18:51
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
回覆: 26
觀看: 15805

天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007

While we are all grinding and polishing, Wong Sir is quitely sitting at the corner trying to prepare the parts for our next telescope assembly lesson. Thank you.
tommy_tse
週二 26 6月, 2007 01:41
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
回覆: 26
觀看: 15805

天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007

Wong Sir demonstrated to us how to use W-Stroke to do the polishing of the mirror using rouge mixture. After one hour of polishing after cold press, the rough mixture on my Pitch Lap looks quite pleasing with chocolate color evenly distributed. I am now ready to polish the mirror for another 10 to 2...

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