9月17号的火星

昨天大气异常宁静。拍下了我到目前为止最满意的一组火星：)

实在好。看来拍火星的好时间还有很多。请过马路给出一个参数吧。

Sorry I can't send the 悄悄话 for some reason. So I have to copy the reply here

Hi Skywater,

I am still downloading your file, it's very slow...

I think IR blocking filter is necessary when mars is low. I tried with and without the filter before and there is a big difference in contrast.

I am having a same condition as yours. Mars only goes up to 32degrees from my location. So the seeing is always a big problem. The only way to fight aganist it is the patience. If you observe every clear night, at least four hours a night. And you will have a good video with good seeing sooner or later.

Besides seeing. There are several other things affect the image quality which we can improve. One is the thermal stability of the scope. If the scope's temperature is higher than the ambient. You can never get a good pic. When I use the C9.25 it usually takes 3hrs to cool down the scope. A fan blowing to the back of the scope would be helpful. Another is the focus. To focus presicely is very important. and a motor focucer would be great plus.


Let me know if your have other questions.

Clear skies,
GY

When I use the C9.25 it usually takes 3hrs to cool down the scope


是在室外吗？加电扇？
如果在园顶内，加电扇，400MM，旁边没人，要多少小时？