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