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Hi John,
I'll suggest you need to think carefully about why you're buying this.
Firstly if you want an ornament for the lounge, a 4"-6" at f/12 - f/15 is going to be pretty big for any room and something smaller might be a better idea.
Instead I'd suggest something more compact such as the brass antique table telescope someone recently sold here on IIS, very pretty and it actually did function. Another rather more masculine lounge telescope is a Questar 3.5".
Secondly if you want to do some observing from the city I'll suggest you should consider an f/12-f/15 Maksutov, with a small secondary than the usual SCT's have - a Intes Micro (7" or 8") or SkyWatcher (180mm) will match a 6" refractor for resolution. Moreover they provide a brighter image and are a far more convenient size to manage; for casual use a cheap isostatic altaz mount is fine.
Personally I have a 4" f/7 refractor (sometimes its in the lounge for visitors) and a 7" f/15 Mak for the nights when i really want to look at something. And I'm in Sydney, FWIW.
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