梵谷風格的傍晚/ 久違的星空/AiryEye 2與SQM的測量差異／補充17日的三日月

 9/10~9/11

(基) 隆河 (笑)。

傍晚基隆河的光影很像梵谷畫筆下的隆河，偽隆河的星夜呵。

The light and shadow of the Keelung River in the evening are very similar to the Rhone River in Vincent van Gogh's paintings. 

It is like a starry night on the fake Rhone River (laughing).

海葵颱風後受外環氣流的影像又過了幾天不穩定的天氣後，終於放晴了，黃昏看天色很漂亮，便先散步到大直橋上觀賞夕陽，然後晚上八點多上鞍部看星星，夜空相當澄澈，觀星到凌晨兩點。

XXX

今晚同時帶了 AiryEye 2代 與 SQM-L 上來實際測量兩者的差異。（因為兩者使用的濾鏡不同，差異是不可避免的。）

在AiryEye 2測量到約20 mpsas的時候 SQM-L的讀數約為20.1，也就是兩者的 mpsas差異僅 5% (換算成亮度差異約8.8%)。0.1 mpsas的差異對於目視來說實用性影響非常小，譬如我們在評估眼視對比門檻時的誤差約為0.7 mpsas，所以0.1的不同其實可以忽略。

Tonight, I brought both the AiryEye 2 and the SQM-L to the Anbu to compare the two. (The difference is inevitable because the two use different filters.)

When the AiryEye 2 measured about 20 mpsas, the SQM-L read about 20.1. In other words, the difference between the two in mpsas is only 5% (about 8.8% in terms of brightness difference). The difference of 0.1 mpsas has a very small practical impact on visual observation. For example, the error in evaluating the eye contrast threshold is about 0.7 mpsas. Therefore, the difference of 0.1 can actually be ignored.

9/11 凌晨約一點左右的夜空

補

8/28

市區剛升起的七姐妹星團（M45）,從6x30尋星鏡即可見

最近拍了張Pentax 全家福

9/17 基隆河的三日月