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Thanks Paul - and remember that you introduced me to these things!
I have spent some time fooling around with them, and agree with your poor seeing comment. Other issue is the difficulty in getting to precise focus, has to do with gearing of the mechanism.
After spending a bit of time with them, and learning stuff, I am a whole lot happier. Nothing like being reclined in a deliciously comfortable chair thing, selecting something to view, getting on target and hitting the button. Bloody marvellous, although injury could occur if I go to sleep and have a kilo of bino (poetic, huh?) slip from my hands and belt me in the face!
Familiarity with them is the answer, testing shows that they are correct optically.
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