You wrote:
If a person has a 10" LX and a 9mm Nagler, 19mm Nagler, 22mm Panoptic,
and 35mm Panoptic, would one benefit from getting the 2" Barlow from
Tele Vue any for visual use?

My reply: With that spread of eyepiece focal lengths, I don't think you
would benefit from a barlow. I have the Meade #140 and rarely use it.
It adds an extra bit of glass and the eyepieces you mentioned have
plenty of glass to reduce the brightness of your intended object.
I have yet to see a barlow at a given power that equals a well made
eyepiece alone at the same power. Barlows do increase eye relief but
all the eyepieces you mentioned are decent in that area.

(http://www.precision-camera.com)
Austin,TX Astronomical Society


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