I have now assembled my prototype using super glue...
I was advised against this but I threw caution to the wind.
Clarity is improved to near perfect when the entire face of the mirror is covered and all air bubbles excluded.
The suggestion of Canada Balsum would also be a very good fix...but I am impatient and the only supply is from E-bay
There are also a number of UV activated lens glues available but I have no experience with them and they are expensive when I consider the number of mirrors I have to mount.
The issue it seems is the distortion caused by the gap between the mirror and the prism. I worked it out and light has to penetrate fourteen surfaces from object to eye....lots of opportunities for distortion.
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