Ok, the above chart seems about right to me. Last night I tried both of the new filters with the binoculars and with a monocular using a 60mm CCD Guide scope.
I did not shoot and SQM reading but the sky was pretty much Bortle 8.
I would say that these probably similar to the Baader 685. Baader says the 685 still allows enough light through at 670nm to allow for visual focus and their published info shows a spectrum chart that suggests a bit later ramp so probably the Baader is a little tighter.
The graph shows that the cut starts to come in at 650nm and sure enough, a very very small amount of H-a made it through. In the generic 650s I could see the tiny little swan nebula pretty easily and while the shape was clearly dimmer in the Antlia, I cold still see the shape of the swan itself in the Antlia and a small amount of the brightest parts of the Lagoon.
The first thing I noticed is that running the Antlia on one side and the generic 650 on the other, I had to turn the gain down on the 650nm to make the view as bright as on the Antlia side. In fact, with the gain up on both sides using the two generics, I usually have to turn the gain down or the Milky Way more or less washes out. With both Antlia's, even with full gain, the MW still showed good structure, so clearly the Antlia is doing a bit better overall. Maybe less leakage in the non near IR.
Overall though, I would say that the Milky Way looked more pronounced using the Antlia filters and in particular, the Pipe Nebula was a bit more obvious in the Antlia filters.
There is some wave like darkening on the rift off of Albiero and while visible in the generic 650s (which seem to be very similar to the Lumicon 650) but I did not notice it the first pass up the rift. When I put on the Antlias and scanned up, I saw them fairly easily and when I went back to the generics I could see them this time though they were more subtle so that is why I missed them the first time.
In the 60mm CCD Guide Scope, I thought that dark mottling and lanes were a slight but meanigfully amount darker than the generics (which again, are pretty similer to the Lumincon).
I have not owned the Baader and now I want to try it. I had a generic 690 for a while but thought it was overly dark and this was before I started observing dark nebula so now I am kind of looking to get more visible red (which is auto tail light pollution and it is far worse than people realize) cut from the view so I plan on spending the money for a Baader for comparison when I get back from Colorado.
Verdict? Well, I think it is better than the Lumicon 650 and generics in general, still allowing a tiny bit of bright H-a to squeak by but overall darkening things and making dark nebula better. Not hugely so, but enough so that these will replace the generic 650s on my binocualars as my standard city filters.
And at $41 apiece, I would say that they are absolutely worth every penny and would probably recommend these over 650nm for semi-urban observing conditions.
I plan on getting the Baader when I return from my trip. It would probably go into my filter wheel on the 6" f/2.8.