universe24 寫:From what I tried before, an exposure of 1/100 sec. still not fast enough to "freeze" particular part of the Sun.
As my current setup not allow me to use expsoure shorter than 1/100 sec., thus I don't how short is sufficient to beat the seeing.
I can use shorter than 1/100s at a focal length of 2250mm on prominence with LS152T. This is much better than LS100T which requires around 1/30s.