this is winter triangle taken via Tamron 19-35mm @f/3.5, exposure time is 15min and was taken at around 1:00am :
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- 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: 2840
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...
- 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
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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: ...