Thanks for the replies, chaps. I'm searching the 'net and reading all sorts of stuff as it's obvious I have a lot to learn (my initial interest in astronomy was 45 years ago but it lapsed fairly quickly due to work requirements). Fortunately I'm a bit of a technology junky so I consider this a challenge!
One of my other interests is shooting and I hate to think how much I've spent on that. Looks like this one could do likewise.
