Excellent points. As the owner of a 12-inch behemoth, I've regretted I didn't get a 10-incher instead. Sent from my iPhone
On Sep 4, 2016, at 11:54 AM, daniel turner via Utah-Astronomy <utah-astronomy@mailman.xmission.com> wrote:
Marlene: At the risk of being called a heretic, I would argue for going the other way and getting a 10 solid tube dob. They are light and easy to set up. They hold collimation if not banged around. They are easy to load in the car and quickly go on short notice. These virtues make them more enjoyable to use and more likely to be used. And thus taken to social events where they are shared with the public. 10 inches is also the sweet spot in the aperture range. Large enough get good looks at dim objects when transported to a really dark site but small enough that the atmospheric seeing will often support their full resolving power on planets. At SLAS public events, it's the 10inchers who really shine on planet views, whether it's Roger's excellent Schmit-Cassegrain or an orion dob. Larger dobs can do just as good most of the time and can do much better, but only on the rare occasions that the seeing allows it. And the bigger the dob the rarer those occasions occur. Normal seeing will support a 10 incher about half the time,. a 15 incher maybe once a night, and an 18 incher less then once a year. Dark sky observing has a similar problem. Truly great conditions occur only on rare occasions maybe once ore twice a year. True those nights are spectacular but you have to spend a lot of nights in just mediocre conditions before you find that one great night. And it might occur when your schedule doesn't allow you to go. Hope this helps. DT
From: Marlene Egger via Utah-Astronomy <utah-astronomy@mailman.xmission.com> To: "utah-astronomy@mailman.xmission.com" <utah-astronomy@mailman.xmission.com> Sent: Saturday, September 3, 2016 8:32 AM Subject: [Utah-astronomy] in the market for a telescope
I am now thinking of purchasing my first telescope, after using the SLAS 12" Orion reflector, Dobsonian base, for awhile. Of course I want the largest aperture that I can afford and lift in and out of my RAV4. I know the sky well enough that I don't need go-to and am not currently doing astrophotography. So I would happily buy a manual telescope now if the price was right. I see that Chuck sold two this week, but I saw the email too late, so this note is to be proactive and let you know I am looking, in case someone else has a working telescope that is just taking up space. So...about lifting...my back is not great and I am not confident about lifting more than 40 pounds. What do others do? Obsession's telescopes come with wheelbarrow set-ups, but they are pricey, too. If I buy a manual 15" Obsession now and add go-to later, I will have spent over $10K when the go-to, paracorr and all that jazz are added in. What is your advice? My contact info is on the SLAS website if you want to contact me directly. Marlene Egger _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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