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LT
週五 25 6月, 2010 19:36
版面: 天文攝影 Astrophotography
主題: Polar alignment in Southern Hemisphere
回覆: 2
觀看: 1358

Polar alignment in Southern Hemisphere

Hi Kurt, Sorry for the delay. Per our conversation on the phone before your departure for Sydney, I promised you wrote up an article of how to do polar alignment in the Southern hemisphere. Now please read below and see the attached document, and hope that is helpful to you to do alignment successfu...
LT
週三 23 6月, 2010 13:36
版面: 二手交易場 Second Hand Area
主題: Modd EOS 350D for sale --- (SOLD)
回覆: 19
觀看: 7055

Thanks for your intention. It was sold.

LT
LT
週二 22 6月, 2010 13:35
版面: 二手交易場 Second Hand Area
主題: Modd EOS 350D for sale --- (SOLD)
回覆: 19
觀看: 7055

Modd EOS 350D for sale --- (SOLD)

Hi, Including this captioned one, I have owned 3 modd EOS DSLRs for astronomy. It is seemed that I own too much already. So now I want to sell this 350D out. With 1 original battery, 1 3rd-party battery, charger, CD-ROM, Manual and box included, the price is HK$2200. Shutter count should be between ...
LT
週一 21 6月, 2010 22:40
版面: 廠製儀器 Factory Equipment
主題: 外國星空夢碎 + STARBOOK 用家 + 電子高手 求救 =[
回覆: 18
觀看: 6059

Gordon, Please try to follow those suggestions mentioned in my PMs to see whether the problem can be fixed. But for avoiding the system from breaking down again, I would suggest you buy one more set of the motors for spare and replacing those failure ones. Then you can get your imaging re-start in t...
LT
週六 19 6月, 2010 09:12
版面: 廠製儀器 Factory Equipment
主題: Newbie questions on Vixen and Takahashi mounts
回覆: 17
觀看: 7132

A mount with better gear can guarantee higher sucess rate in unguided imaging absolutely. But usually the cost of these high-end mounts are not cheap. Two more factors of affecting unguided performance are the precision of polar alignment and system flexure, especially for those heavy tele-photo len...
LT
週六 19 6月, 2010 09:04
版面: 廠製儀器 Factory Equipment
主題: Newbie questions on Vixen and Takahashi mounts
回覆: 17
觀看: 7132

Except GP2/CPD and their clones, it is seemed that all goto mount cannot be run manually if the electronics is dead.

For GP series, the mount can be shifted to manual operation by installing a "clutch" to both axes.

If you need this accessory, you may contact me.

LT
LT
週六 19 6月, 2010 08:44
版面: 廠製儀器 Factory Equipment
主題: GP2數問~
回覆: 3
觀看: 2097

Hi Zephyr,

Where/whom did you get this used GP2 from?

If the RA/Dec worm part or the clutch is bent, you can contact me for replacement.

LT
LT
週二 15 6月, 2010 13:53
版面: 望遠鏡 廠制儀器 測試報告專欄 Telescope Testing Report Center
主題: Takahashi FSQ 85 ED 光學討論
回覆: 253
觀看: 134414

Suggest to make such a aperture mask as shown in the attachment and place it in front of any refracting telescope and then take a shot of point source with a little overexposure.

Maybe the answer would come out immediately after checking the on-axis image.

Wish suggestion working.

LT
LT
週一 07 6月, 2010 17:27
版面: 天文攝影 Astrophotography
主題: 台灣合歡山昆陽停車場的夏季銀河
回覆: 28
觀看: 11768

LT兄 個人對這棵鏡頭覺得很滿意 光圈F2.8全開時星點也很不錯 我的是舊版的Sigma 15mm F2.8 EX 新版的是 F2.8 EX DG 不過我用的是50D APSC的機身 周邊星點以15mm來說還在可以接受的範圍 不確定在全幅機身上星點變形嚴不嚴重... Thank you very much for your reply. Then how to compare new version DG with old version EX? does DG perform a bit better such as on contrast and star images at the c...
LT
週日 06 6月, 2010 23:36
版面: 天文攝影 Astrophotography
主題: 台灣合歡山昆陽停車場的夏季銀河
回覆: 28
觀看: 11768

Hi Roger, These are absolutely fabulous shots. Thanks for sharing us with your masterpieces. Hope I can visit Taiwan this summer again. I am looking for a wide-angled lens for shooting milkway with my astronomy trip in July this year. Seemed your Sigma 15mm performs quite good. What is your comment ...
LT
週五 04 6月, 2010 16:15
版面: 天文話題 Everything about Astronomy
主題: Something happened on Jupiter
回覆: 8
觀看: 2881

Here is the video from Chris Go.

http://astro.christone.net/jupiter/jupiterimpact.wmv

Enjoy.

LT
LT
週五 04 6月, 2010 08:50
版面: 天文話題 Everything about Astronomy
主題: Something happened on Jupiter
回覆: 8
觀看: 2881

Something happened on Jupiter

Something happened on Jupiter ! http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/3845244/page/0/view/collapsed/sb/5/o/all/fpart/1 This Australian amateur recorded a rare impact on Jupiter again in this year. Bird (Anthony) is just focussing and keen on watching planets, especially Ju...
LT
週三 02 6月, 2010 18:45
版面: 天文攝影 Astrophotography
主題: RHO from 2008 in NZ
回覆: 10
觀看: 4100

Wah!! 寫:How about this "LRGB" version? Combining your L and my RGB.
Good! Good! Good!

Could you show us how to do it?

LT
LT
週三 02 6月, 2010 16:41
版面: 天文攝影 Astrophotography
主題: RHO from 2008 in NZ
回覆: 10
觀看: 4100

syyuen168 寫:Wah!! 好靜呀! 我又買返支EF 85mm f/1.8玩吓先 :D :D
The comment on this lens seemed very positive, especially on portrait and daily shooting.

Do you really want to get one? If interested, please contact me. I want to replace it with macro 100mm or 135.2L

LT
LT
週三 02 6月, 2010 16:39
版面: 天文攝影 Astrophotography
主題: RHO from 2008 in NZ
回覆: 10
觀看: 4100

Wah!! 寫:仲有得谷恆d~
Thanks for your magic hand. But your version shows more noise and artifact. I would prefer mine, seemed to look a little more natural.

LT

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