@scratchypants I also like having a nice 8x56 at hand. I don't do a ton of extreme dark conditions, but it's something that comes every now and then (usually for something special, like owls). I do have an AK 8x56, the Vixen New Foresta (a sibling is sold under the German brand DDOptics, Pirschler Gen II). It is nice and has pretty good low light capabilities, but at 1230 g they are a bit of a beast.
Regarding looking for another low light but lighter alternative, I remember when I first bought my first 8x56, a Delta Optics ROH, which has pretty decent light transmission figures. At that time I also had a 7x42 Zeiss Victory FL and I could do extensive comparison between them and, to be honest (to my 44 year old eyes at the time) only in the darkest conditions could I spot a noticeable difference. In dusk or dawn, I think they showed a similar level of clarity. Only well beyond twilight, actually during the night, could the 8x56 show its strength.
So now comes what I have done, given that I like the 8x56 Vixen but I find I end up using them less than I would if they were more portable. I remembered reading a review in Allbinos from a "quirky" format, 8.5x52 (another Minox, incidentally, an HG BR), and that caught my eye. It spots a 6 mm exit pupil, probably more than enough for you or me, and it weights 775 g, just like an 8x42. Yes, it's all about compromises, the Minox has a narrow FOV (the Vixen is quite good at that with a 7,2º FOV) and apparently it suffers from some CA issues. They're on their way as I type this, so I will report when I get them, but there are a couple of entries about them here in BF. It is a not-so-new design, but it was the HG series, apparently made in Germany, so chances are it is still fully usable.
I hope I could give you some ideas to think about
