Talk:List of largest optical reflecting telescopes

message: The SOAR telescope has a diameter of 4.1m, not 4.2.  Does it still qualify?--Jkru214 07:07, 17 September 2007 (UTC)
thread_title:  SOAR? 

message: Should the twin mirrors of the LBT be treated as one while the larger Kecks are treated as two?  Aside from being in adjacent buildings, what is different between the LBT twins and the Keck twins? 66.218.190.100 (talk) 19:49, 26 August 2008 (UTC)
thread_title:  LBT vs. Keck 

message: Some of that was probably good but wp:Original research, but some of it seemed problematic, and some was simply not correct.  Please wp:edit summaries, wp:reliable sources.- sinneed (talk) 17:15, 28 August 2009 (UTC)
thread_title:  Reverted an edit described as "misc" 

message: Can anyone explain to me the purpose of the stem and leaf plot? What encyclopedic benefit does it provide? 99.242.102.36 (talk) 06:41, 26 November 2010 (UTC)
replies: text: hmmm... yeah. Its also quite WP:JARGON. Don't see any reason for it per WP:SAL and unless there is some obvious reason to have it looks like it could simply be deleted. Leaving it for now to see if it can be improved or explained. Fountains of Bryn Mawr (talk) 23:20, 14 February 2011 (UTC)
thread_title:  Stem and Leaf 

message: :Without adaptive optics telescopes have Strehl ratios of less than 1% but first generation AO can boost this up to 20–30%.
Moved above to talk because it is 100% WP:JARGON (and its ref dead-ends so no way to check out the claim). Needs work. Fountains of Bryn Mawr (talk) 23:05, 14 February 2011 (UTC)
thread_title: Strehl ratio jargon

message: I find this to be redundant especially since the top table includes the size and year built. In addition to this, the lower table includes the largest telescope every year. Any thoughts on this? Yialanliu (talk) 01:26, 25 July 2012 (UTC)
replies: text: Agreed, it's pretty pointless trivia. The table of the largest historically is all that's needed. PS. new discussions should go at the bottom of the page, see WP:TALKNEW. Modest Genius talk 11:00, 25 July 2012 (UTC)
thread_title: Top Telescope 2000 and 2010

message: I moved Large Binocular Telescope down the list from largest because it was moved up by an IP without comment/reason and this is an extremely qualified claim. This abstract describes it as "A unique feature of LBT is that the light from the two primary mirrors can be combined optically in the center of the telescope to produce phased array imaging of an extended field. In practice this extended phased field can be of order 1-arcminute in diameter". I am basing it on the list def exclusion of interferometry, including "phased array" in that, although this list def is not fully expressed. List def could be better written/modified. Other refs      . Fountains of Bryn Mawr (talk) 15:55, 11 February 2013 (UTC)
replies: text: I'm pretty sure that the LBT has an incoherent mode, whereby the two mirrors just collect a lot of light and send it to a common instrument (or two copies of the same instrument). By collecting area that does indeed make it the largest - Keck and VLT only have interferometric multi-mirror modes. I don't have a reference to hand though. Modest Genius talk 16:11, 11 February 2013 (UTC)
thread_title:  Is the [[Large Binocular Telescope]] the largest? 

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thread_title:  External links modified 

message: There are at least two different ways to define which telescope is the largest.  One is by the light gathering area (which determines the faintest objects that can be seen) and the other is the maximum baseline (which determines the minimum angular resolution).  I would like to see both of these numbers listed in the table so that readers could sort by whichever statistic they choose.  --Lasunncty (talk) 02:22, 17 March 2016 (UTC)
thread_title:  different ways to define "largest" 

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replies: text: The science.howstuffworks.com archive is good.  The ociw.edu link is now at obs.carnegiescience.edu.  The lbti.as.arizona.edu archive is good.  The gmto.org archive didn't work, but I found another page on that site that had the referenced information.  --Lasunncty (talk) 01:54, 25 May 2017 (UTC)
thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: The largest of High Energy Stereoscopic System telescopes is 28 m in diameter and is a reflecting telescope and isn't on the list. With 28 m, shouldn't it be first?
77.103.237.203 (talk) 17:39, 8 January 2019 (UTC)
replies: text: HESS is a gamma-ray telescope, not an optical telescope. Modest Genius talk 15:56, 9 January 2019 (UTC)
thread_title: H.E.S.S. Telescope

message: As of 2018, the VLT appears to have combined the beams of all 4 of their telescopes, and fed it into a single instrument. ESO claims that the equivalent apperture is 16 meters. Doesn't it mean that, as of now, the VLT is the largest working optical telescope? Although they do not share the same mount, the light is still collected in a single instrument. Shouldn't the same mount requirement be dropped?  Source by ESO here 80.112.163.52 (talk) 13:45, 2 May 2020 (UTC)
replies: text: It is possible to use all four UTs to feed the optical interferometer, and ESO has done so a few times per year. But >95% of the time they operate as independent telescopes, observing completely different objects with separate instruments. The interferometer mostly operates with the much smaller ATs. There is no incoherent feed for the UTs - it's not possible to use all four telescopes together with a non-interferometric instrument. So describing them as a single telescope would be misleading. In contrast, the LBT mirrors are on a single mount and always observe the same object, and it uses a mix of coherent, incoherent and duplicate-instrument modes. Those are qualitatively different ways of observing. I think the UTs should continue to be four separate entries, but perhaps the list should be clearer that it is excluding interferometric-only modes. Modest Genius talk 11:06, 4 May 2020 (UTC)
thread_title:  Isn't VLT the largest combined optical telescope, as of 2018?