You find them by doing searches on the auction sites, reading a lot about vintage wide field binos here and on cloudy. Then asking lots of questions, then finding what you want , then asking the sellers the appropriate needed questions. Then pulling the trigger and hoping you get a good one. Most everyone I bought in over a year needed tweaking to collimation even when the seller said they were right on. The other things are mechanicals. If you want some more advice or suggestions PM me.I'm on the lookout for a super wide 7x35, just trying to find a model available in good condition. Buying these older second hand models is a minefield unseen, I've had issues before. I may well just stick with the eii, how do you find these older superwides in comparison to the eii?
Im considering selling a beautiful Tasco 110 12.5° BaK4 , one of the premium and very rare desirable super wides.