Mine is 720nm, so it really only works in B&W. I've never played around with a 590 nm. I assume you could just get a 720 nm filter for your 590 camera if you wanted to go for the deep blacks in the sky or would that lose too much light?Both are very cool, I think I lean towards #1 as to it's speaking to me the most. I still don't use my IR camera for B&W much, I really should though.