Re: Swarovski Binoculars?
I would go all the way with the 80mm spotter if I spent the money myself. I'm using the 12-40 Leopold now also and it works great, nice field of view and eye relief. The one thing to be sure of on the doubler if you go that route, is to check and make sure that it can be used in BOTH eye pieces. I'm not positive but something makes me think that it is made to fit in one eyepiece only. I may be wrong, but but if that's the plan I would be sure first.
I like the tripod adapter on the Swarovski a little better than the Leica but the brightness and clarity was noticably better on the Leica at dark hands down when I compared the two, that's what sold me on them. I thought both were superior to the Ziess although they were nothing to sneeze at. You'll do good to compare at dark all models one after the other viewing the same object.
I looked down the street at the underside of a couple vehicles with only a street light on in the distance lending little light. It was about 200yds away. The Ziess resilution chart proved to validate my findings also. Peoples eyes may be different, I'm not sure how much that affects these type of tests though. Lots of luck.