barlows

[nicnac]

Televue 2x barlow or Televue powermate 2.5x barlow with Televue Radians in a TAL150p F/5 ??

[Rossco72]

Hi there,

I have no experience with your particular scope, but I have both the 2x barlow and the 2.5x powermate and the powermate is a definate step up.

Sometimes though the extra mag is too much which is why i keep the barlow..

Cheers

Stuart

[johninderby]

Here's a quote from Al Nagler that may help.

"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. "

John