[SkysoBright (Jase)]

Hey guys, i'm an old member that has rejoined. god know what my last username was. but anyway. i've rejoined as i'm thinking about getting back into astronomy.

One thing i'm looking at getting into is astrophotography. Now i've started doing a little research on the web as i'm wanting to photo DSO's. From the info i have seen i need a telescope around the f4 ratio.

I've been looking at the schmidt-cass types, but these seam to be f10. What it the best focal ratio needed for DSO's. And what is the best for planets.

Can i turn an f10 into an f4 by adding things on.. if you know what i mean.

Also, just another quick question. Why are telescopes from the US so much cheaper than from australia. An example of a telescope i've been looking at... Celestron Advanced Series C9.25-SGT Schmidt-Cassegrain Telescope is about US$2000, but in australia it's AU$3700. Can anyone shed some light on this.

Thanks in advaice.