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Message: <blockquote data-quote="giosblue" data-source="post: 3326847" data-attributes="member: 134930">Another thing to remember Roy, the differences I've mentioned are not "night and day" I've since sold the Optolyth, but I would be perfectly happy going birding with it with the fixed 30x and that was 20 odd years old.  With the latest 30x I would expect to be even better. I think because more modern scopes are a bit brighter, the zooms would work better on them rather then an old scope. I don't know, I'm only guessing.Anyway, what do you think of the TSN4?</blockquote>