Quote:
Originally Posted by silv
for moon and planets F5 would not be ideal. F5 is a fast light collector and therefore fine for faint, distant objects like deep space nebula.
Jupiter would only look like a very bright star through F5 - it did so through mine, at least (8" F/5 newtonian).
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Hi, just a comment about this: I suspect that either you picked a bad night or your scope needs collimating, because you should be able to see a lot of detail on Jupiter in an f5 8" scope. If it just looks like a bright star, either you aren't looking at Jupiter or you have a
very low power eyepiece, because even at 30x it will look like a little ball with a couple of lines across it, and you will see the moons very easily.
If you look at (say) 150-200x on a good night you should get a lovely sharp image, with multiple cloud bands, the GRS, etc. The low f ratio is probably not the most ideal for planetary viewing, but it will still give good images in an average scope.
I have an f5 dob, and the Jupiter images are fantastic. Even on a night of very poor seeing last weekend I was able to see the GRS.
All the best,
Dean
