Quote:
Originally Posted by andys
Well, I think I did - just appeared as little dots on either side - it was only 200x.
What would be the best eyepiece for viewing Saturn then?
|
well, so many answers to this one.
with a planet, as high a magnifiction as you can go given the conditions.
In a nutshell, you need great seeing to push past 200x. I have a 4mm eyepiece so in my 1250 focal length scope gives me say 300x (1250 divide 4)
I actively cool my primary mirror so that it is the same temperature as the ambient air temperature. this takes away the boundary layer problems (think of looking at the roof of a car on a hot day and seeing the shimmers!)
You then are in the lap of the gods.....is the surrounding area still shimmering, ie are roof tops radiating heat, are you near your brick house which is also radiating heat.
A lot of us are starting to image jupiter at 4am, due to the fact that the atmosphere is generally a lot stiller, less heat radiating off objects etc. The magnification is up around 1600x or more.
The other factors are jetstream, ie high level, high speed winds and also the prevailing wind hitting objects like hills and mountains. ie if the air is coming from a certain direction, then if it hits a mountain it tends to shoot up vertically and then eddy as it moves over the mountain and beyond.
Ideally, an island like the bahamas is great as the air comes off the ocean (no mountains) and is very still. The bahamas also do not have the jetstream annoying it as much.
So at the end of the day, you will have nights when you an ramp up the magnification and other nights where you wished you never bothered at all. Some of it is in your control, the rest is in the lap of the gods!
Welcome to highs and lows of Astronomy (hence why we go a little crazy around here)
For