有 427 筆資料符合您搜尋的條件

gary125
週日 01 2月, 2004 15:28
版面: 天文攝影 Astrophotography
主題: star field picture at Xiu Kwan on 27 Dec 03
回覆: 2
觀看: 2837

one more:

this is winter triangle taken via Tamron 19-35mm @f/3.5, exposure time is 15min and was taken at around 1:00am :
gary125
週日 01 2月, 2004 14:49
版面: 天文攝影 Astrophotography
主題: star field picture at Xiu Kwan on 27 Dec 03
回覆: 2
觀看: 2837

star field picture at Xiu Kwan on 27 Dec 03

Hi, I finnaly acquired an Epson 1650 48bit photo scanner with cheap cost ($850 only). attached pls find one of my wide field photo at orion : technical data : canon EOS 66 / 50mm f/1.8 @f/4 and 15min exposure, photo taken at 27Dec at around 2:00am, Vixen polaris mount with celestron CG-4 motor drive...
gary125
週六 31 1月, 2004 13:08
版面: 廠製儀器 Factory Equipment
主題: 論鏡 1
回覆: 147
觀看: 213974

hmm.. just curious to know : do the field curvature casued by the telescope, or by the ep itself ?
Wah! 寫:咁即係場曲啦?
gary125
週五 09 1月, 2004 18:08
版面: 廠製儀器 Factory Equipment
主題: EQ5雙軸
回覆: 9
觀看: 9912

In my understanding

eq-5 = made from bosma

celestron cg-5 = made from synta

both are Chinese factory

Wah! 寫:EQ-5是國產的??!
我還以為是外國生產的呢!!!
gary125
週一 29 12月, 2003 21:36
版面: 廠製儀器 Factory Equipment
主題: measuring perioidic error of GP-DX + SS2k
回覆: 3
觀看: 5647

thank you for your comment. I just return from China yestersday and the most valuable prize for me is the starry night and naked eye horse head. :-D :-D
gary125
週二 23 12月, 2003 15:08
版面: 廠製儀器 Factory Equipment
主題: measuring perioidic error of GP-DX + SS2k
回覆: 3
觀看: 5647

measuring perioidic error of GP-DX + SS2k

Hi experts, I have calculated the periodic error of my GP-DX mount / ss2k system ( PEC function is off) with the M36 image taken at TKO site on 13 Dec 03. As I don't know if my method is correct or not, would you please comment my assumptions / deriving methods. all comments are welcomed . (remark: ...
gary125
週六 18 10月, 2003 12:49
版面: 天文攝影 Astrophotography
主題: vixen ss100s 拍的月球。
回覆: 24
觀看: 24272

some technical info of Vixen Ss100S for your reference :

aperature : 100mm, focal length : 680mm , f/6.8
achromatic doublet , helical focuser, weight = 2kg.

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