Re: newbie question

From: steve church (steve_at_rivend.freeserve.co.uk)
Date: 02/06/05 

Date: Sun, 6 Feb 2005 20:35:51 -0000

> Optical quality is the most important factor for planetary viewing but
> not the only one. Low obstruction and smooth tracking are also high on
> the list.
> To ensure high optical quality you should look for a Newtonian longer
> than F6. If it is not too large for you consider an F8-F10. As far as
> aperture goes you need to balance resolution against seeing. The larger
> the aperture the higher the resolution but the fewer instances of good
> seeing you will experience. Its hard to say what will be best for you
> but since it is your first telescope project I would not recommend
> anything over 8".

Whats the meaning of the F number and it's relation to length? Also
aperture?(Yes I really am a newbie)

> If you make your own optics they may not be back from the for mars. I
> honestly don't know how much of it is tax but Orion optics seem
> overpriced. Before shipping a 6" set of high quality is 300 pounds.
> The same quality mirror in Canada sells for 127 pounds.

We're holidaying in Canada later this year (25th wedding aniversary treat).
I may end up with excess baggage with
that much glass!
>
> Ian Anderson
> www.customopticalsystems.com
>