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Archive 2016 · Canon telephoto lens array used to find dark matter galaxy
  
 
halse
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p.1 #1 · p.1 #1 · Canon telephoto lens array used to find dark matter galaxy


A bit about the discovery
http://www.dunlap.utoronto.ca/instrumentation/dragonfly/
And some info on how multiple 400 mm f/2.8 lenses were combined to make the array
http://petapixel.com/2015/05/27/this-telescope-uses-10-canon-lenses-worth-100000/

and for some technical details if you want to try this at home
http://www.astro.caltech.edu/~ycao/B&ETalks/vandokkum_bne.pdf



Oct 01, 2016 at 02:56 AM
rbf_
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p.1 #2 · p.1 #2 · Canon telephoto lens array used to find dark matter galaxy




halse wrote:
A bit about the discovery
http://www.dunlap.utoronto.ca/instrumentation/dragonfly/
And some info on how multiple 400 mm f/2.8 lenses were combined to make the array
http://petapixel.com/2015/05/27/this-telescope-uses-10-canon-lenses-worth-100000/

and for some technical details if you want to try this at home
http://www.astro.caltech.edu/~ycao/B&ETalks/vandokkum_bne.pdf


Very cool!



Oct 01, 2016 at 03:03 AM
qc_mountain
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p.1 #3 · p.1 #3 · Canon telephoto lens array used to find dark matter galaxy


I wonder how many time they must calibrate the lens in order to be exactly the same each

Just the aligment part must not be a easy task and then the perfect focus on each lens also.

Francois



Oct 01, 2016 at 03:36 AM
lowside67
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p.1 #4 · p.1 #4 · Canon telephoto lens array used to find dark matter galaxy


It blows my mind that it has been increased from 10 to 48 lenses in 2 banks of 24, here is one bank:



Mark



Oct 01, 2016 at 03:49 AM
EB-1
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p.1 #5 · p.1 #5 · Canon telephoto lens array used to find dark matter galaxy


qc_mountain wrote:
I wonder how many time they must calibrate the lens in order to be exactly the same each

Just the aligment part must not be a easy task and then the perfect focus on each lens also.

Francois


They probably have some students working on it.

EBH



Oct 01, 2016 at 03:55 AM
garyvot
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p.1 #6 · p.1 #6 · Canon telephoto lens array used to find dark matter galaxy


"Canon f400 f/2.8 II lenses have ~10x less scatter than the (superb) Burrell Schmidt."

Hooray for Super Spectra Coating.

Edited on Oct 01, 2016 at 06:25 AM · View previous versions



Oct 01, 2016 at 05:37 AM
EB-1
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p.1 #7 · p.1 #7 · Canon telephoto lens array used to find dark matter galaxy


It's those newfangled nano coatings not available in 1939.
I suppose Canon could make an even better "astro" version of the 400/2.8 by designing it without IS.

Link should be this: CWRU - Burrell-Schmidt Telescope

EBH



Oct 01, 2016 at 05:40 AM
wlpelzmann
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p.1 #8 · p.1 #8 · Canon telephoto lens array used to find dark matter galaxy


Thanks! VERY interesting application of the new nano coating.


Oct 01, 2016 at 09:08 AM
 

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garyvot
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p.1 #9 · p.1 #9 · Canon telephoto lens array used to find dark matter galaxy


EB-1 wrote:
Link should be this: CWRU - Burrell-Schmidt Telescope

EBH


Thanks for catching that, I fixed the link... (not sure what happened).

Best,

Gary



Oct 01, 2016 at 02:18 PM
JamesLarsen
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p.1 #10 · p.1 #10 · Canon telephoto lens array used to find dark matter galaxy


That is really cool! And even cooler, how he put all those lenses together!


Oct 01, 2016 at 02:26 PM
hotdog12
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p.1 #11 · p.1 #11 · Canon telephoto lens array used to find dark matter galaxy


Astonishing--this was the first I've heard of this. Not only that, they could sell all those juicy lenses to sports shooters if the program loses its funding.


Oct 01, 2016 at 03:27 PM
Snopchenko
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p.1 #12 · p.1 #12 · Canon telephoto lens array used to find dark matter galaxy


Peter (PetKal) must have had a hand in this. Him, or EBH.


Oct 01, 2016 at 03:44 PM
Liquidstone
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p.1 #13 · p.1 #13 · Canon telephoto lens array used to find dark matter galaxy


Glass porn..... great stuff.


Oct 01, 2016 at 10:55 PM
EB-1
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p.1 #14 · p.1 #14 · Canon telephoto lens array used to find dark matter galaxy


garyvot wrote:
Thanks for catching that, I fixed the link... (not sure what happened).

Best,

Gary


You forgot the W.

EBH



Oct 01, 2016 at 10:58 PM
EB-1
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p.1 #15 · p.1 #15 · Canon telephoto lens array used to find dark matter galaxy


Snopchenko wrote:
Peter (PetKal) must have had a hand in this. Him, or EBH.


Not I. I was waiting for that 600/4 DO, but am not sure now. I may just get a new 500/4 IS II.

EBH



Oct 01, 2016 at 11:02 PM







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