Bob doesnt want facts
Unless they can be twisted by his ignorant mind into 'proof' for his preconcieved notions... Any facts that dont support him are just the product of those close minded experts that actually have an education on the subject...
The color of the photos will not be what you would see if you were actually there, The fact Bob cant grasp this just demonstrates how uneducated he is on his subject...
As for your statements about the wavelengths, I can vouch that 390 nm and 780 nm are "visible" but at the extreme limits of the range of the human eye... What Bob doesnt understand that the people doing real work are interested in more than pretty pictures... they choose the wavelengths to supply the most useful data...