On Thursday, October 14, 2021 at 10:45:12 PM UTC-6, StarDust wrote:
Only !😮Actually, the price is quite reasonable. While my reaction may be unwarranted and unreasonable,
Price:
US $98,000.00
for an item of this scarcity, I have to ask: does the seller actually have one, and if so, is it
of legitimate provenance?
I mean, a sixty-inch reflecting telescope. There aren't many of those in the whole world; while
that's less than 200 inches, and it's less than 100 inches, one is still talking about one of the
world's major observatories here, not anything "amateur" in size or performance.
John Savard
Only !😮
Price:
US $98,000.00
Having now examined the listing:
Apparently it is military surplus.
The mirror is f/3.75.
Also, the seller is unsure of whether the figure is parabolic or hyperbolic, and of the
grade of Zerodur used for the mirror.
While the Mount Wilson 60-inch is f/16 in Cassegrain configuration, I couldn't find
out what the focal ratio of just the mirror was.
John Savard
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&campaignid=12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
eBay item number:143164027946
Only !😮
Price:
US $98,000.00
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&campaignid=12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
eBay item number:143164027946
Only !😮
Price:
US $98,000.00
On Thursday, October 14, 2021 at 9:45:12 PM UTC-7, StarDust wrote:12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&campaignid=
eBay item number:143164027946
Only !😮And this for a mirror that is not even known to be parabolic!
Price:
US $98,000.00
On Thursday, October 14, 2021 at 9:45:12 PM UTC-7, StarDust wrote:12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&campaignid=
eBay item number:143164027946
Only !?
Price:
US $98,000.00
And this for a mirror that is not even known to be parabolic!
On Fri, 15 Oct 2021 21:17:21 -0700 (PDT), palsing <pnal...@gmail.com>campaignid=12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
wrote:
On Thursday, October 14, 2021 at 9:45:12 PM UTC-7, StarDust wrote:
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&
eBay item number:143164027946
Only !?
Price:
US $98,000.00
And this for a mirror that is not even known to be parabolic!It doesn't necessarily need to be parabolic... but it does need to be accurately figured to some known curve. That's kind of an important
detail to be missing!
While the Mount Wilson 60-inch is f/16 in Cassegrain configuration, I couldn't find
out what the focal ratio of just the mirror was.
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On Saturday, October 16, 2021 at 6:39:27 AM UTC-7, Chris L Peterson wrote:campaignid=12873834688&mkgroupid=116682566330&rlsatarget=pla-1262931797002&abcId=9300536&merchantid=8174544
On Fri, 15 Oct 2021 21:17:21 -0700 (PDT), palsing <pnal...@gmail.com>
wrote:
On Thursday, October 14, 2021 at 9:45:12 PM UTC-7, StarDust wrote:
https://www.ebay.com/itm/143164027946?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1NCBGwyJKQNaWqqO76WCCRA24&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=143164027946&targetid=1262931797002&device=c&mktype=pla&googleloc=9032048&poi=&
It doesn't necessarily need to be parabolic... but it does need to be
eBay item number:143164027946
Only !?
Price:
US $98,000.00
And this for a mirror that is not even known to be parabolic!
accurately figured to some known curve. That's kind of an important
detail to be missing!
Re figuring / repolishing this 2 m mirror can be very expensive and time-consuming, I think.
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