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- 週三 13 4月, 2011 21:43
- 版面: 天文攝影 Astrophotography
- 主題: My version of coalsag with 40D + 35mm taken last year
- 回覆: 1
- 觀看: 1224
My version of coalsag with 40D + 35mm taken last year
Hi XR-250, My skill in imaging processing is just at beginner level, and I very often don't know how to process an image well, especially on color balance. So, this image just share you with my preference how to present this part of milkyway, and I pay strong attention not to burn the Eta out. I don...
- 週二 12 4月, 2011 21:50
- 版面: 天文話題 Everything about Astronomy
- 主題: 測試 GPD2 + Maxvision ED127/F7.5
- 回覆: 7
- 觀看: 3167
- 週二 12 4月, 2011 21:39
- 版面: 天文攝影 Astrophotography
- 主題: 陰那山Galaxy之夜
- 回覆: 24
- 觀看: 5182
Re: 陰那山Galaxy之夜
清明節後的第二天上山,天氣尚可。第一天有些霧氣,透明度只有7/10左右。第二天好轉至9/10,但和「紅土地」當然無得比了。 兩個晚上拍了很多星系。可惜autoguide有點問題,每過3分鐘左右DEC曲線就出現很大波動,RA則很平靜。未知是否對極不準,還是個guidescope有fracture問題,浪費了很多light frames。 No, not due to polar misalignment issue. That is due the the backlash in Dec motor. Most goto mounts have this issue except those ...
- 週二 12 4月, 2011 21:32
- 版面: 天文攝影 Astrophotography
- 主題: Eskimo from last night in YL
- 回覆: 14
- 觀看: 5129
Visual performance, that VMC is very close to C8, except the contrast at very high power due to larger secondary mirror and thicker spider vanes. Vixen modify the design of the correcting plate to a meniscus corrector lens installed in front of the secondary mirror. That design modification results ...
- 週二 12 4月, 2011 21:16
- 版面: 天文攝影 Astrophotography
- 主題: Southern Cross, Coalsack, Eta Carina
- 回覆: 16
- 觀看: 5269
Did you stretch the level or curve too much in PS? The Eta has been burnt out. Try next version with a little "light hand"! Seemed the transparency of the sky during this period at that place is very high. Please come dinner with me to share your experience in Melbourne and this place when you free,...
- 週二 12 4月, 2011 21:11
- 版面: 天文攝影 Astrophotography
- 主題: The Teapot in Milky Way
- 回覆: 16
- 觀看: 4116
- 週二 12 4月, 2011 00:17
- 版面: 天文攝影 Astrophotography
- 主題: M51 with VMC200L
- 回覆: 3
- 觀看: 1764
M51 with VMC200L
Hi, Still experimenting on the trick in using PHD for successful auto-guiding. This M51 was taken in PTC with clouds frequently crossing over the imaging area on last Saturday night. Moreover, the transparent was low too. So, the S/N ratio was very very low. This time level and curve stretching very...
- 週二 12 4月, 2011 00:08
- 版面: 天文攝影 Astrophotography
- 主題: Eskimo from last night in YL
- 回覆: 14
- 觀看: 5129
Thanks everyone. SS Tong: I used side-by-side guiding method. Including the multiplate, guide mount, the whole imaging and guiding rig is about 9 kg. For the VMC200L OTA, it weighs only about 6 kg. For a serious astrophotographer, the load may be a bit over with SXW. But if there is no wind, and the...
- 週日 10 4月, 2011 21:48
- 版面: 天文攝影 Astrophotography
- 主題: Eskimo from last night in YL
- 回覆: 14
- 觀看: 5129
Eskimo from last night in YL
Hi, A test to learn more on the parameter settings in PHD and see if PHD could auto guide imaging focal length at 1280mm successfully with SXW goto mount. Seeing was very bad, and so, no seeing no details. Guiding seemed ok but the stars were fat. Moreover, focus a very little bit out as I used live...
- 週六 02 4月, 2011 08:57
- 版面: 天文攝影 Astrophotography
- 主題: A quickie Leo Triplet from yesterday
- 回覆: 6
- 觀看: 2396
A quickie Leo Triplet from yesterday
Hi, Originally had a very high expectation on AP shooting in the evening when seeing the cloudless blue sky yesterday. So decided to go to PTC instead of TMS. But, when arrived, very disappointed, very hazy and foggy. I could only rate the transparency as 3 to 4/10. Then any expectation on DS shooti...
- 週六 12 3月, 2011 09:06
- 版面: 天文攝影 Astrophotography
- 主題: M42 with ED70SS
- 回覆: 4
- 觀看: 6130
- 週六 12 3月, 2011 09:06
- 版面: 天文攝影 Astrophotography
- 主題: 陰那山:海鷗星雲
- 回覆: 8
- 觀看: 3472
- 週三 09 3月, 2011 22:46
- 版面: 天文攝影 Astrophotography
- 主題: M42 with ED70SS
- 回覆: 4
- 觀看: 6130
M42 with ED70SS
Still an instrument test for your reference to think of a small and portable apo refractor for AP in or outside HK. Photographic data: Vixen ED70SS F5.6 apo refractor + Taiwanese-made field flattener + LPS + Canon modded 300D @iso400 RAW Autoguided with 3cm F5 refractor + QHY5 + PHD on SXW goto moun...
- 週五 11 2月, 2011 23:11
- 版面: 天文攝影 Astrophotography
- 主題: My latest attempt -- M51 with ED70SS
- 回覆: 7
- 觀看: 3303
My latest attempt -- M51 with ED70SS
Hi, Still running test on this little Vixen ED apo to see its performance in wide field AP as well as the correct parameters setting in PHD. Seemed I am getting to know and grab the tricks on successful auto-guiding with PHD. This M51 was taken in the mid-night of Feb 8th after a trip to China. It w...