Ten Canyon 400mm lenses were used in cool way to discover Ultra Diffuse
Galaxies (UDG) in the "Dragonfly telecope array".
The UDG's must seemingly have a ton of dark matter to avoid being torn to bits.
http://www.dunlap.utoronto.ca/instrumentation/dragonfly/
http://www.thedailybeast.com/articles/2015/06/22/scientists-discover-hundreds-of-hidden-galaxies.html
Just returned from Pays Basque, hope I haven't missed too much, Mike
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