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With your OTA F/L of 2350mm, a 6.7mm ES 82D will give you mag 350x and a TFOV of approx. 14 arcminutes.
You will rarely get to use it, as seeing rarely supports anything over 300x (and often is limited to 150x or below, in my experience). Personally, I would hang on to your money with that one. IMHO, you should stick with the 11mm for a while and see how many times you get to use it in a year before going shorter.
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