1 頁 (共 1 頁)

Geminid Meteor Shower

文章發表於 : 2010-12-26, 01:53
Robin
Out of 500 Raw files (about 14GB), I managed to capture three Geminids from them. Since I only have a Panasonic LX3 (I took one night of images with this but I haven't dug out the raw files yet), I borrowed a Canon 550D from my friend. After a couple of trial and errors, I discovered ISO6400 and 10s exposure was the best combo for my slightly light-polluted sky using the 17-55mm f/3.5-5.6 kitlens.

圖檔
This single frame was subtracted by bias and dark frames using Deep Sky Stacker. All of the photos were subtracted in DSS except mentioned otherwise.




圖檔
I used the RGB alignment function in DSS and ended with this almost black and white photo. What I did was aligning the RGB Gaussian distributions into one. Did I do the right thing?

圖檔
I used the curve preset in Photoshop to produce this negative photo.

圖檔
I processed the raw of this image in MaximDL (subtraction of bias and dark frames) and did a level adjustment. I went on with more level adjustment in Photoshop afterwards. I am most happy with this frame. The next thing I gonna do is to enhance the background by stacking it with a nine frames stack of the same background which is ready. Any comment on how I could improve further?

圖檔
A bright Geminid fireball flew out of the frame. How I wish I had a wide-angle lens.

圖檔
The meteor in this image is harder to see but still quite recognizable if you look hard enough. It's roughly at the bottom 1/3 line.

Thanks for looking and your comment is most appreciated.

这也是我在CN发表的同一篇。懒惰再打了。:P

Re: Geminid Meteor Shower

文章發表於 : 2010-12-26, 02:10
universe24
还不错...以前用负片真的很难拍摄得到流星...

Re: Geminid Meteor Shower

文章發表於 : 2010-12-26, 11:08
社長
Nice image, Robin!

98年跑到北京興隆觀測站看獅子座流星雨,當晚拍了幾張曝光45分鐘的星流跡,都紀錄了七八顆流星,是用E100S正片的。但那晚是火流星居多,而且我用的是16 f2.8光圈鏡頭所以能夠紀錄下來。

我看拍流星真的是比ISO、比光圈,或許用到f2、f1.4會再好一點的。

Re: Geminid Meteor Shower

文章發表於 : 2010-12-26, 13:53
Robin
社長 寫:Nice image, Robin!

98年跑到北京興隆觀測站看獅子座流星雨,當晚拍了幾張曝光45分鐘的星流跡,都紀錄了七八顆流星,是用E100S正片的。但那晚是火流星居多,而且我用的是16 f2.8光圈鏡頭所以能夠紀錄下來。

我看拍流星真的是比ISO、比光圈,或許用到f2、f1.4會再好一點的。

还有比视角范围 :P 若是有个广角镜,我的战利品至少能多4倍。。。很多流星都是在我的视角范围外。。。有个鱼眼就大获全胜,不过边缘成像素质就不知道如何。

我把相机的ISO升到6400,光圈到kitlens最小的f/3.5。

话说那晚我看到一个火流星从北部天区跨越到东部整整半个天球之大,长达两秒以上。。。太震撼了!

Re: Geminid Meteor Shower

文章發表於 : 2010-12-26, 14:02
社長
拍流星雨的,若要展示輻射點的型態,全片幅計,24mm的視角是比較合理的。

若要捕捉個別火流星的噴流等細緻點的現象,50mm左右會好些,因為能涵蓋最少一兩個星座,但也要看運氣。

鏡頭質量在那情況下其實不太重要,一來重點已不在星點是否幼細,而且用星流跡方法拍也可以。

98年那次獅子座流星雨,星預計高峰期前一晚才是最精采的演出,在午夜前的11時30分左右,即輻射點尚在地平面附近,有一顆火流星從東北地平出沒,左右傍著兩顆小一點的,一長兩短的火舌劃過天頂向東南面的北京城方向飛去,維時超過1分多鐘,當年北韓正試射導彈,若不是我用雙筒鏡細看過是流星,又是獅子座流星雨期間,以及相信不可能有導彈在這麼敏感的方向飛去,否則我們會以為是導彈或戰鬥機之類的。

不過前年我們為北京那位朋友裝圓頂時,的確北京軍區的飛機在上空巡視過一會的 :?

viewtopic.php?f=12&t=239

Re: Geminid Meteor Shower

文章發表於 : 2010-12-26, 14:04
Robin
也是有道理。在APOD有看到几张1998年狮子座火流星的都是用1xxmm的镜头来拍。。。而且有一张还猎了三个。人品爆发啊