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I feel your pain, people steal my jokes than give wretched deliveries Isaac Send a noteboard - 01/02/2010 09:04:25 AM
Heh, I see. Still, that's a lot better than most folks could manage on a personal budget; I'd wager it was every penny of $10k, and probably closer to twice that. If it was Celestron, they don't make a 12" SCT (though they do make an 11" ) and I can't even find the tube online for <$5k (marked down from >$8k in one case. ) Obviously adding mounts, tripods, motors and computer databases will push that substantially higher even before we start talking quality eyepieces and filters.


I want to say the grant was 120k, we may have added some funds from the school's coffers and this was a decade and change back, but it was for the whole building, dome, scope, computers, and I think they even had to run power buried to it, which I'm sure cost at least a few grand. Neverthless I'm sure the scope was a good 10k minimum, probably more.

I think you're generally correct; typically when you get to that scale and degree of interest it makes a lot of sense to sell your old one when you buy a new one because it takes a lot off the new ones pricetag, and you're not going to use your 9.5" SCT much once you unpack that 14" (this is one of the reasons I advise people to find out as much as they can about what they want BEFORE purchase, and then get precisely that or as close as they can afford so they don't buy a dozen telescopes over 20 years. ) Personally, I'm not sold on the 9.5" because it seems like a poor compromise for people who want >8" but can't quite get high enough for an 11". It's another example of what I said above: Don't upgrade one step at a time, go in leaps, because otherwise you end up paying a lot more money for marginal performance increases. My 4.5" reflector is a great scope and I love it, but if/when I buy the next one it'll be the 8" SCT, which is a whole other animal.


I'd agree, too many upgrades in between and you're basically just tossing money away, even if you get a good price on resale. The nice thing about the first scope you buy (as opposed to marginally functional ones most of us got as kids) is you can regift it to a kid or nice/nephew etc, but after that any higher end scope is just gonna gather dust once you upgrade, might as well try to get a decent price on ebay. Personally I doubt I'd ever go beyond a 8", the CGEM 800 looks pretty good and I could see myself buying it or something like it in the future, but anything beyond that, I can't see myself stargazing often enough to justify that even if I was rolling in cash, too much existential guilt. Ironically I'd be more likely to go further up with a dob because then I could justify it as 'an educational expense' if I had kids. "Come children, let's go work on daddy's light bucket". I probably should buy a new scope, I like the look of the Nexstar line but something in me rebels about having computer controls on a personal scope, presumably the same one that prefer paperbacks to ebooks and shudders at the idea of getting an electric tea kettle, need to be ale to fiddle with the knobs or the fun's gone.

The main thing that makes me leery of buying an SCT on EBay is I have little more security than the sellers feedback history and (possibly) shipping insurance, and I remember the hell my mom went through with an insured candy dish that was about $20 and arrived broken. I don't want to play that game with $500 or more. Anyone going that route, however, should read the description carefully; sometimes it's a scope with motor, tripod and maybe even a computer. Others it's just a tube and you'll have to buy a mount, tripod and motor, and you may end up spending as much that way as you would buying it new, with less warranty and possibly a discontinued unsupported scope (I'd love to get the old C-8, but they were discontinuing it 15 years ago to make way for Nexstars, and now it's only available used. )


I always encourage people to use ebay but for these sort of reasons I almost never buy things used off the net, even books, and it's pretty hard for someone to destroy one of those to the point it can't be resold and properly used, short of maybe dropping it in the bathtub.

Brass is useless ornamentation, IMHO, but all I've heard is that wood>metal for tripods because it handles changing weather conditions better, doesn't expand and contract with temperature and humidity to as great a degree.


I guess brass was ideal prior to aluminum, presumably it gives stuff an antique feel. Wood probably is okay as the tripod, but I'd think fiberglass would be better.

Not really sure why anyone would by a dobsonian, make one, sure, but buy one of them? Always look like someone couldn't decide if they were building a water heater or a cannon.

That may be the best description I've ever heard. Not everyone is great with precision engineering though; I fantasize about one of the huge truss reflectors you see in science mags, but it would be very easy to screw up assembly, and while $2000-$3000 is a steal for 2-3' of aperture, it's still a lot of money to leave on the curb for pickup.


It seems safe to do it, emphasis 'seems', I'm looking over a pdf on building them right now (link below) and it doesn't seem like too hard a project. Definetly two-person I think, at least for a lot of it. Except for the optics nothing in it is pricy enough that a mistake ruins the project. There's really no minimum size for one, so I suppose a proto-type would be advisable before shooting for a full blown juggernaut.

Yeah, if you've got a laptop it's totally doable (I don't, because I still feel I can get more computer for the money with a desktop, plus I hear laptops don't really have modular design, so you "upgrade" with a new one. )


I'm typing on a desktop right now, haven't bought a laptop in years, but I've owned two and I was doing a lot of traveling at the time so it was worth it. Now, not really expecting to travel much, so I'd agree.

I hear ya, man, believe me. We've still got multiple disk cases filled with 5.25" disks with everything from DOS 2.10 (my original OS) to Wordstar 3.0 to a copy of Norton Utilities that was so hard to find my parents had to go to their CS instructors house for it.


Ah, wordstar, I still remember when WYSIWYG was new and cool and a megabyte was a lot of data. Somewhere around here I have dot matrix printer and a 286, probably still work. This is why I despise computers and cell phones, they change too fast, I know all sorts of tricks for software that no longer exists, that bugs me.

And, yes, I firmly believe the top telescope brands are tops for a reason. I much prefer Celestrons SCOPES; they're a little more expensive than Meade, but they also developed the process of mass producing Schmidt corrector plates that made them commercially viable. Meade basically "flattered" Celestron when they began using the same process, but while they are slightly less expensive I think Celestron still makes the better quality scopes. I generally prefer Meades eyepieces though; I don't know why, but they seem to be sturdier and perform better. IMHO, it's a big step down in quality to Orion, and I don't seriously consider anything less. Bushnell makes DECENT spotting scopes if you're on a budget, but anything more from them is throwing away money, IMHO.


Haven't worked with either enough or recently enough to be able to say, but both are reliable companies. I don't like bushnell though, a rifle scope bias, I tend to think of Leupold as making superior scopes than Bushnell.
The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift.
- Albert Einstein

King of Cairhien 20-7-2
Chancellor of the Landsraad, Archduke of Is'Mod
build a dob
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