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Tele Vue diagonals are one piece construction so heavy eyepieces wont unscrew the barrel from the diagonal as can happen with other brands. This is normally only a problem with heavy eyepieces usually on the 2" diagonals but an item such as a binoviewer could unscrew a 1.25" diagonal.
Not sure how the Tak is made. Also if you want to get the last few photons of light then perhaps an Everbrite is the way to go.
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