www.astrocafe.hk

遲交功課，好過唔交。

儀器:
Skywatcher Equinox 120 + HEQ5Pro mount
Canon EOS350D modified
LVI guider
10x2min ISO800
Borg 7887 reducer
LPS P2 filter

軟件:
Flatfield by PixInsight
Processed by Photoshop CS5 & Neat Image

oh my god!

若不計你之前用 Epsilon 180ED 三分鐘曝光盲跟隨意調焦那些，這張算是你的首張深空照了

或許 Equinox 120 配 #7887 的後焦點還要調一下以優化像質，但至少看到你的調焦及追蹤已近完美了，更何況當日西貢的天空透明度那麼低。

很欣慰的看到，你也好、Willis也好、Henry也好，在我花數分鐘示範下，便能自行拍攝深空，而且成積很不俗的，這些一再說明，深空拍攝就是那麼容易，只要做好幾個基本步，調焦、追蹤、曝光，出品是不會差的。

期待更多佳作!!!

The color & the detail are very good! However, there is a bit coma at the corner. May be one needs to fine tune the back focus a bit in order to achieve the best result. As far as I know, Borg provides spacers for non-Borg refractor users to fine tune the back focus.

可以看出改版的350D是這麼優秀的，當然我的改版5D Mark II更厲害。

看到David這幅圖，有點忽發奇想.....

若Equinox 120配7887可以用10x2min拍成這個樣子，那Equinox 100直焦配5D Mark II可能會更厲害。

論光圈 F9 vs F7.5x0.85 = 1級光圈 或 長了2x曝光時間，但我的5D Mark II實用感光度是ISO 1600，看我台灣的作品便知道，比350D快了一倍，即一來一回曝光也是10x2min便可以，最重要是，以Equinox 100的F9光圈計，我可以不用平場鏡，而且焦距長了18%，解像度也提升了，而且F9的光學系統，色差修正度也明顯較優，對於那些球狀星團來說，應是一絶....

有點衝動想今週末拿台Equinox 100來試試

Another version with more nebulosity. Layer mask is used for the central region.

I like this one, what more you can ask for under sky condition that night?

congratulations! your "first photos" are among the best of those taken around same time frame in Hong Kong.

deep sky imaging is so easy and duplicatable, so keep it simple and enjoy.

幫 David "優化"一下影像質量 - resize 50%出圖　

65% resize

I've tried almost the whole series of Equinox, which include 66ED, 80ED & 120ED. All are good visual performers. It seems that 120ED is a good imaging tool too. Let be try the 80ED, if the weather is good...

willis 寫:I've tried almost the whole series of Equinox, which include 66ED, 80ED & 120ED. All are good visual performers. It seems that 120ED is a good imaging tool too. Let be try the 80ED, if the weather is good...

I did visual test with Equinox 100 also, both HK and Macau observatory brought HEQ5 Pro + Equinox 100 from me. The Equinox 100 can be a well corrected imaging tool without flattener, but quite slow, may be only good for clusters and bright nebulae only. But definitely a powerful tool for solar work.