#1  
Old 29-10-2016, 02:41 PM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,945
The DRAGONFLY Telescope

Hello Folks,

Here is an interesting account of a telescope (Or as they've called it, telephoto array) made of an array of 48 Canon 400mm 2.8 II L Lenses. They didn't state the equivalent aperture of those 48 lenses, so working it out - every doubling of area of the light gathering (doubling of lenses) is equivalent to 1 f-stop lower aperture- i.e: (2^(0.5)) = 1.414x... lower aperture .... So that works out to .... ???

1 lens - 400mm f/2.8
2 lens array 400mm f/2
4 lens array 400mm f/1.4
8 lens array 400mm f/1
16 lens array 400mm f/0.7
32 lens array 400mm f/0.5
64 lens array 400mm f/0.36

So for 48 lenses it's around (too lazy to be exact) 400mm f/0.4 - No too bad. Start saving your favourite telephoto lenses!!! These were $10k each.

Best
JA



See story here ... >>>
https://www.dpreview.com/news/619621...r-new-galaxies
Attached Thumbnails
Click for full-size image (dragonfly_48-12.jpg)
184.4 KB64 views
Click for full-size image (dragonfly_48-4.jpg)
200.2 KB61 views

Last edited by JA; 29-10-2016 at 03:06 PM.
Reply With Quote
  #2  
Old 29-10-2016, 02:56 PM
Merlin66's Avatar
Merlin66 (Ken)
Registered User

Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
Whooooo!
There's a fair amount of $$$$$ tied up there.
The effective Aperture will increase, but as each lens is independent the f ratio will still be f2.8.
Stacking the 48 (?!) images gives the performance....
Reply With Quote
  #3  
Old 29-10-2016, 04:11 PM
omegacrux's Avatar
omegacrux (David)
Registered User

omegacrux is offline
 
Join Date: Jan 2012
Location: Ulverstone Tas
Posts: 733
Seen this on fb pretty crazy in an awesome way

David
Reply With Quote
  #4  
Old 29-10-2016, 04:23 PM
Slawomir's Avatar
Slawomir (Suavi)
Registered User

Slawomir is offline
 
Join Date: Sep 2014
Location: North Queensland
Posts: 3,240
This kind of system got me thinking of having 3 telescopes for simultaneous collection of Ha, OIII and SII data...maybe it is now slightly less impossible with recently released more affordable CMOS cameras...or even better, it would be very nice to have a 3-layered sensor with each layer collecting only one particular wavelength and at the same time being transparent to the rest of the incoming light...or reflecting the rest of incoming light to another sensor within the same camera...okay, where is my toolbox?
Reply With Quote
  #5  
Old 29-10-2016, 04:30 PM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,945
And here is a lecture on the need for such an instrument and use ...

Best
JA

Hopefully that embeds it as a youtube ????
Reply With Quote
  #6  
Old 02-11-2016, 06:56 PM
Lognic04's Avatar
Lognic04 (Logan)
Registered User

Lognic04 is offline
 
Join Date: Mar 2016
Location: Melbourne, VIC
Posts: 889
Quote:
This kind of system got me thinking of having 3 telescopes for simultaneous collection of Ha, OIII and SII data...maybe it is now slightly less impossible with recently released more affordable CMOS cameras...or even better, it would be very nice to have a 3-layered sensor with each layer collecting only one particular wavelength and at the same time being transparent to the rest of the incoming light...or reflecting the rest of incoming light to another sensor within the same camera...okay, where is my toolbox?
Suavi, maybe something like a dslr Bayer filter, because the individual pixels are optical filters for RGB, or probably better something like a Sony mirrorless transparent mirror(see pic) that reflects the light to a viewfinder, replace the viewfinder with a sensor and you're set
http://www.cs.mtu.edu/~shene/FORUM/T...LT-Cutaway.jpg
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 12:51 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement