Bojan,
Suggest you read their webiste and some of their papers and see the unbelieveable scientific advances and savings they have made.
Its a complete paradigm shift in discovery.
The single major scientific benefit is that whilst almost all other Earth telescopes are limited to 28 magnitude imaging, the DragonFly arrays are limited to 32 magnitude imaging
The other benefit is that for less than $1M they can have the benefits of a much larger telescope costing between $10m and $100m, but given they go another 4 magnitudes deeper - they can do what the others simply cannot do !
How much is that worth in science ?
The world is spending Billions on new projects and these guys are doing more for a miniscule fraction of the cost - under $1M !!!
Their huge improvement in observation means they are now seeing stuff that nobody has ever seen before and in doing so they they have upturned a huge number of conventional paradigms and continue to provide discoveries such as Galaxies that (on conventional theory) are comprised of 98% dark matter etc etc
Galaxies that shouldnt exist, new types of Galaxies - the list is endless
Literally hundreds of scientific papers have come from this small teams efforts and its opened the doors to entirely new science and new understanding of cosmology - and raising significant questions about most of the current theory of galactic evolution and formation.
Its worth the time to read.
Rally
Quote:
Originally Posted by bojan
We had a discussion of this forum earlier about dragonfly concept (using Canon 400mm f/2.8 lenses).
I don't think there is any benefit (apart from saving imaging time perhaps) that would justify the cost of such instrument.
I fully agree with Slawomir's comment below 
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