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Thank you John - your input is very much appreciated.
I will offer one humble comment albeit possible correction to your comments purely informed by the item descriptions I seem to find on various websites.
In my own experience I have not come across any reference to Televue Radians or any Televue eyepieces as using/featuring lanthanum glass. Product descriptions are simply listed as 'ED' glass when anything is provided.
On many sites the item description for Pentax XF's state that they use lanthanum glass. On a few sites however the description of the glass in the XF series simply state that they use ED glass. However, on all sites that I have found the item description for the Pentax XW series are always clearly described as featuring lanthanum glass.
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