A couple of comments on the Habicht:
1. All three of them have one real problem - the stiffish focuser. It gets somewhat better with use, but it'll never be as smooth as, say, the focuser of the Nikon SE. That's the price you pay for them being waterproof porros.
2. All three of them are classic porros that were designed over 50 years ago. No problem with that, there are plenty of porros designed more than 50 years ago that - with modern coatings, that the Habicht has - could compete with any roof on the market today as far as the image quality IN THE CENTER is concerned. But the Habicht, and that applies to all three models, with its (relatively) simple eyepieces, simply isn't as "easy" to use as as a binocular with modern, large eyepieces. They don't have a flat field, like e.g. the Swarovisions or the Nikon SE, and all three models are also quite difficult (or, depending on the glasses, impossible) to use for people wearing glasses.
3. All three models are quite light for their specifications, and due to their simple, old-fashioned construction easy to service. They are also pretty tough, especially the 7x42 GA and the 10x40 GA. Their armour is a far cry from the soft, rubbery stuff used by most manufacturers nowadys, rather it's a military grade rubber armour (the 7x42 is still used by the Austrian army among others). I've been told by people who should know that if they were to start living on a small island in the middle of nowhere, they'd prefer to take a rubber armoured Habicht over any modern roof. There's nothing much that can go wrong unless you drop them hard on rocks.
4. That said, there are quite clearcut differences between the three models:
- The 7x42 is the odd one out because of its (very) narrow field of view. It has very simple eyepieces (reversed Kellners, as far as I know). However, the optical quality is quite outstanding. There are virtually NO problems with veiling glare, and the transmission is IMO even higher than that of the other two models. In addition, the stiffish focuser isn't that much of a problem due to it being only 7x.
- The 8x30 and the 10x40 have more complex eyepieces (Erfle). Of these two the 8x30 has got rather clearcut problems with veiling glare. Henry explained the reasons behind this years ago. The 10x40 is much, much better in that respect. I don't think it's quite as good optically as some of the top roofs, like a Zeiss 10x42 HT (provided you get a good one ... :king
, and it sure is slower. But it's still very, very good indeed. I wouldn't use it for birding in the woods or ar migrations hotspots with lots of bushes though. The slow focuser just doesn't work in that kind of environment.
Hermann