As I am talking about long wavelength (towards 900-1000nm) CCD sensitivity, I thought I would share with you these three images of M51;
In order, the central wavelength of each filter that was used is :
(1) 435nm (near photometric B band)
(2) 555nm (near photometric V band)
(3) 814nm (near photometric I band)
But , said Virginia, "The amount of visible dust decreases; so what? Why is that important to astronomers?"
Answer: Because you get to see
what is behind the dust!
