kowa tsn4 vs newer crop of kowa scopes
The newer models are waterproof, if that's important to you, but optically, your TSN4 is still an excellent scope and considering the price of a new 77mm or 88mm fluorite Kowa, you will spend a huge amount of money for not that much gain. What I would explore, though, is perhaps upgrading the eyepieces if you are still using old TSN4 series eyepieces. The new 600/660 series of eyepieces that you would use on that scope are a big improvement over the old eyepieces. I especially like the 20-60, TE-9Z zoom. That may provide all the upgrade you want at a much nicer price.
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