Hello,
In the post 8 above, Typo provided a link to Report: BGA Classic: in post 11 he ranks bins ergonomically, by his preference, and I was struck by the reference to the Viking MD 6.5x32 models. I had assumed Viking bins to be mediocre.
There was not a lot to go on, searching via Google,but these bins were closed-out a few years back at £99. However, I found a couple of pairs, second hand, one at £99 and the other at £99.99.
There were a couple of others that I found but they were much more expensive.
After consulting with Typo, who is extraordinarily helpful, I decided that I could not justify spending more than £100, particularly with these bins having an eye relief quoted at 22mm. (My optician measured the distance from my eyes to the front glass of my specs at 20mm, so I hoped they would be fine.) I bought the cheaper of the two bins.
The other pair may be seen here:
http://www.stevensimpsonbooks.com/?page=shop/disp&pid=page_Optics .
Tuesday pm: the bins arrived before noon. I took them into the dining room to unpack them; they were naked - strap not fitted no caps and a possibly third party soft case. On my way to our lounge I passed through the kitchen and weighed them on our postal scales - 700 grams not the specified 600 grams I was expecting and hoping for. I consider this to be inexcusably sloppy of Viking.
I adjusted the diopter first and then tried the view, having set the ipd to 64 mm. I could not get the bins in a good position and was experiencing black outs. I have 'o' rings. I used two per side, each of 1 mm diameter. Better, but not quite there, so I added another one each side - perfect!
Typo warned me that the eye cups wobble, and they do but this does not affect me wearing specs.
I am very satisfied with their sharpness, brightness and contrast. The view is wide and the depth of field is fabulous. Sitting in my lounge with the bins focussed on the closest feeder, I can see further with acceptable sharpness, as far as I need. No need to refocus just bring them up to my eyes and watch.
The weight issue won't go away but I can live with that.
To use a technical term, I am thrilled.
My thanks to you all, and particularly to Typo.
Best wishes,
The-Wanderer