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I note that the following appears in a thread on Cloudy Nights, posted by a Televue dealer:
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Bert,
I'm really sorry I don't normally make recommendations on our product
for TOS reasons. But since both products are our products I don't see a problem.
How Al answered Lawrence in 1999 is exactly our recommendation today.
You didn't say what type of scope you have. If you called Tele Vue, We would have recommended the Big Barlow if you have a Newtonian, and the powermate if you have a refractor. The reason?,
For the Nagler eyepieces the optical benefits of the powermate are invisible, however, ergonomically in a Newtonian both the BB and powermate will reach their parfocal point.
In a refractor, where a diagonal is used, the BB will not come close to reaching it's parfocal point, and an inch or so of in-travel will be required.
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John Rhodes (TV Rep.)
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