I guess I'm really just not a wavelength guy, or at least the only ones I appreciate are 405, UV, and infrared for their wavelength properties. What in the world does a 671nm offer that a 650 or 638 doesn't?
Na this is my first CNI. I hear they are really good quality and I'm pretty excited about getting one for such a good price. Hopefully they come in before the 4th.
Aside from that, it's a wavelength I don't own. So I pretty much have to get it. It's a deeper red. Read through Aryntha's review for a good breakdown, and some pictures, it's posted SEVERAL times throughout this thread.
Again, a deep red. When I see it unfocused, I immediately think "dry". Something about it just says dry red, though that makes no sense. It's a pure red, it makes 650 look like a red violet crayon in a way.
It's hard for me to describe red from each other. I've seen so many wavelengths past 600 that it's hard to differentiate really, half of my spectrum is >600nm! They are look very similar. Greens and yellows are very different with 10nm, but red, that's a whole other animal.